fix(package): update dotenv to version 8.1.0

Closes #10

Author: greenkeeper[bot]

package.json

@@ -19,7 +19,7 @@
   "dependencies": {
     "apollo-boost": "^0.1.22",
     "cross-fetch": "^3.0.0",
-    "dotenv": "^6.2.0",
+    "dotenv": "^8.1.0",
     "graphql": "^14.0.2"
   }
 }