diff --git a/package-lock.json b/package-lock.json
index 81d627a..9489128 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1301,6 +1301,7 @@
       "resolved": "http://r.cnpmjs.org/boom/download/boom-2.10.1.tgz",
       "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
       "dev": true,
+      "optional": true,
       "requires": {
         "hoek": "2.x.x"
       }
@@ -1790,6 +1791,7 @@
       "resolved": "http://r.cnpmjs.org/combined-stream/download/combined-stream-1.0.8.tgz",
       "integrity": "sha1-w9RaizT9cwYxoRCoolIGgrMdWn8=",
       "dev": true,
+      "optional": true,
       "requires": {
         "delayed-stream": "~1.0.0"
       }
@@ -2586,7 +2588,8 @@
       "version": "1.0.0",
       "resolved": "http://r.cnpmjs.org/delayed-stream/download/delayed-stream-1.0.0.tgz",
       "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "depd": {
       "version": "1.1.2",
@@ -3217,7 +3220,8 @@
       "version": "1.3.0",
       "resolved": "http://r.cnpmjs.org/extsprintf/download/extsprintf-1.3.0.tgz",
       "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "fast-deep-equal": {
       "version": "3.1.1",
@@ -3378,27 +3382,9 @@
       }
     },
     "follow-redirects": {
-      "version": "1.10.0",
-      "resolved": "http://r.cnpmjs.org/follow-redirects/download/follow-redirects-1.10.0.tgz",
-      "integrity": "sha1-AfUmOu6SHGpU+5Fmfwj0FVzhaes=",
-      "requires": {
-        "debug": "^3.0.0"
-      },
-      "dependencies": {
-        "debug": {
-          "version": "3.2.6",
-          "resolved": "http://r.cnpmjs.org/debug/download/debug-3.2.6.tgz",
-          "integrity": "sha1-6D0X3hbYp++3cX7b5fsQE17uYps=",
-          "requires": {
-            "ms": "^2.1.1"
-          }
-        },
-        "ms": {
-          "version": "2.1.2",
-          "resolved": "http://r.cnpmjs.org/ms/download/ms-2.1.2.tgz",
-          "integrity": "sha1-0J0fNXtEP0kzgqjrPM0YOHKuYAk="
-        }
-      }
+      "version": "1.14.7",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.14.7.tgz",
+      "integrity": "sha512-+hbxoLbFMbRKDwohX8GkTataGqO6Jb7jGwpAlwgy2bIz25XtRm7KEzJM76R1WiNT5SwZkX4Y75SwBolkpmE7iQ=="
     },
     "for-in": {
       "version": "1.0.2",
@@ -3543,7 +3529,8 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -3561,11 +3548,13 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -3578,15 +3567,18 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -3689,7 +3681,8 @@
         },
         "inherits": {
           "version": "2.0.4",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -3699,6 +3692,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -3711,17 +3705,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "1.2.5",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.9.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -3738,6 +3735,7 @@
         "mkdirp": {
           "version": "0.5.3",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "^1.2.5"
           }
@@ -3793,7 +3791,8 @@
         },
         "npm-normalize-package-bin": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "npm-packlist": {
           "version": "1.4.8",
@@ -3818,7 +3817,8 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -3828,6 +3828,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -3896,7 +3897,8 @@
         },
         "safe-buffer": {
           "version": "5.1.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -3926,6 +3928,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -3943,6 +3946,7 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -3981,11 +3985,13 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         }
       }
     },
@@ -4463,7 +4469,8 @@
       "version": "2.16.3",
       "resolved": "http://r.cnpmjs.org/hoek/download/hoek-2.16.3.tgz",
       "integrity": "sha1-ILt0A9POo5jpHcRxCo/xuCdKJe0=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "home-or-tmp": {
       "version": "2.0.0",
@@ -5206,7 +5213,8 @@
       "version": "0.1.1",
       "resolved": "http://r.cnpmjs.org/jsbn/download/jsbn-0.1.1.tgz",
       "integrity": "sha1-peZUwuWi3rXyAdls77yoDA7y9RM=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "jsesc": {
       "version": "0.5.0",
@@ -9471,7 +9479,8 @@
       "version": "0.14.5",
       "resolved": "http://r.cnpmjs.org/tweetnacl/download/tweetnacl-0.14.5.tgz",
       "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "type-is": {
       "version": "1.6.18",