chore(deps): update dependency graphql-tools to v4

Author: renovate-bot

package.json

@@ -28,7 +28,7 @@
     "ava": "0.25.0",
     "graphql": "0.13.2",
     "graphql-middleware": "1.7.3",
-    "graphql-tools": "3.0.5",
+    "graphql-tools": "4.0.0",
     "prettier": "1.14.3",
     "prettier-check": "2.0.0",
     "semantic-release": "15.8.1",

yarn.lock

@@ -154,10 +154,6 @@
     into-stream "^3.1.0"
     lodash "^4.17.4"
 
-"@types/graphql@0.12.6":
-  version "0.12.6"
-  resolved "https://registry.yarnpkg.com/@types/graphql/-/graphql-0.12.6.tgz#3d619198585fcabe5f4e1adfb5cf5f3388c66c13"
-
 "@types/graphql@0.13.4":
   version "0.13.4"
   resolved "https://registry.yarnpkg.com/@types/graphql/-/graphql-0.13.4.tgz#55ae9c29f0fd6b85ee536f5c72b4769d5c5e06b1"
@@ -241,15 +237,7 @@ anymatch@^1.3.0:
     micromatch "^2.1.5"
     normalize-path "^2.0.0"
 
-apollo-link@1.2.2:
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/apollo-link/-/apollo-link-1.2.2.tgz#54c84199b18ac1af8d63553a68ca389c05217a03"
-  dependencies:
-    "@types/graphql" "0.12.6"
-    apollo-utilities "^1.0.0"
-    zen-observable-ts "^0.8.9"
-
-apollo-link@^1.2.2:
+apollo-link@^1.2.2, apollo-link@^1.2.3:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/apollo-link/-/apollo-link-1.2.3.tgz#9bd8d5fe1d88d31dc91dae9ecc22474d451fb70d"
   dependencies:
@@ -1858,11 +1846,11 @@ graphql-middleware@1.7.3:
   dependencies:
     graphql-tools "^3.0.5"
 
-graphql-tools@3.0.5:
-  version "3.0.5"
-  resolved "https://registry.yarnpkg.com/graphql-tools/-/graphql-tools-3.0.5.tgz#544542dbf2fddc8c3d7d654965285a3bc747b10b"
+graphql-tools@4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/graphql-tools/-/graphql-tools-4.0.0.tgz#6ea01937c6f947212f83567ba687e97c22fdd2a6"
   dependencies:
-    apollo-link "1.2.2"
+    apollo-link "^1.2.3"
     apollo-utilities "^1.0.1"
     deprecated-decorator "^0.1.6"
     iterall "^1.1.3"
@@ -4377,12 +4365,6 @@ zen-observable-ts@^0.8.10:
   dependencies:
     zen-observable "^0.8.0"
 
-zen-observable-ts@^0.8.9:
-  version "0.8.9"
-  resolved "https://registry.yarnpkg.com/zen-observable-ts/-/zen-observable-ts-0.8.9.tgz#d3c97af08c0afdca37ebcadf7cc3ee96bda9bab1"
-  dependencies:
-    zen-observable "^0.8.0"
-
 zen-observable@^0.8.0:
   version "0.8.8"
   resolved "https://registry.yarnpkg.com/zen-observable/-/zen-observable-0.8.8.tgz#1ea93995bf098754a58215a1e0a7309e5749ec42"