fix: move graphql to peer dependencies (#4)

There can be only one instance of `graphql` dependency, so we needed to move it to the `peerDependencies` section.

Author: ardeois

package.json

@@ -23,8 +23,10 @@
     ],
     "dependencies": {
         "@graphql-codegen/plugin-helpers": "^1.8.1",
-        "casual": "^1.6.2",
-        "graphql": "^14.5.8"
+        "casual": "^1.6.2"
+    },
+    "peerDependencies": {
+        "graphql": "^14.0.0"
     },
     "devDependencies": {
         "@auto-it/conventional-commits": "^7.12.3",
@@ -40,6 +42,7 @@
         "eslint-plugin-import": "^2.17.2",
         "eslint-plugin-jest": "^22.20.0",
         "eslint-plugin-prettier": "^3.0.1",
+        "graphql": "^14.5.8",
         "graphql-toolkit": "^0.5.19-beta.0",
         "jest": "^24.9.0",
         "prettier": "^1.18.2",