[example] Make sure only 1 graphql package is installed.

Author: alloy

example/package.json

@@ -25,7 +25,7 @@
     "classnames": "2.2.5",
     "express": "^4.15.2",
     "express-graphql": "^0.6.4",
-    "graphql": "^0.9.1",
+    "graphql": "^0.12.3",
     "graphql-relay": "^0.5.1",
     "prop-types": "^15.5.10",
     "react": "^15.6.1",

example/yarn.lock

@@ -2745,12 +2745,6 @@ graphql@^0.12.3:
   dependencies:
     iterall "1.1.3"
 
-graphql@^0.9.1:
-  version "0.9.3"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-0.9.3.tgz#71fc0fa331bffb9c20678485861cfb370803118e"
-  dependencies:
-    iterall "1.0.3"
-
 handle-thing@^1.2.5:
   version "1.2.5"
   resolved "https://registry.yarnpkg.com/handle-thing/-/handle-thing-1.2.5.tgz#fd7aad726bf1a5fd16dfc29b2f7a6601d27139c4"
@@ -3264,10 +3258,6 @@ isstream@~0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/isstream/-/isstream-0.1.2.tgz#47e63f7af55afa6f92e1500e690eb8b8529c099a"
 
-iterall@1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/iterall/-/iterall-1.0.3.tgz#e0b31958f835013c323ff0b10943829ac69aa4b7"
-
 iterall@1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/iterall/-/iterall-1.1.3.tgz#1cbbff96204056dde6656e2ed2e2226d0e6d72c9"