fix(deps): update graphql-tag to v2.7.3

Author: renovate[bot]

basic/package.json

@@ -29,7 +29,7 @@
     "apollo-client-preset": "1.0.8",
     "expo": "25.0.0",
     "graphql": "0.13.1",
-    "graphql-tag": "2.6.1",
+    "graphql-tag": "2.7.3",
     "react": "16.2.0",
     "react-apollo": "2.0.4",
     "react-native": "https://github.com/expo/react-native/archive/sdk-25.0.0.tar.gz"

basic/yarn.lock

@@ -2862,7 +2862,11 @@ graphql-anywhere@^4.1.3:
   dependencies:
     apollo-utilities "^1.0.6"
 
-graphql-tag@2.6.1, graphql-tag@^2.4.2:
+graphql-tag@2.7.3:
+  version "2.7.3"
+  resolved "https://registry.yarnpkg.com/graphql-tag/-/graphql-tag-2.7.3.tgz#5040112a1b4623285ef017c252276f0dea37f03f"
+
+graphql-tag@^2.4.2:
   version "2.6.1"
   resolved "https://registry.yarnpkg.com/graphql-tag/-/graphql-tag-2.6.1.tgz#4788d509f6e29607d947fc47a40c4e18f736d34a"