Update graphql dependency to 0.13.x

package.json

@@ -81,7 +81,7 @@
     "express": "^4.16.2",
     "express3": "*",
     "flow-bin": "^0.65.0",
-    "graphql": "^0.12.3",
+    "graphql": "^0.13.1",
     "isparta": "4.0.0",
     "mocha": "5.0.1",
     "multer": "1.3.0",
@@ -92,6 +92,6 @@
     "supertest": "3.0.0"
   },
   "peerDependencies": {
-    "graphql": "^0.10.0 || ^0.11.0 || ^0.12.0"
+    "graphql": "^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0"
   }
 }

yarn.lock

@@ -2003,11 +2003,11 @@ graceful-fs@^4.1.2, graceful-fs@^4.1.4:
   version "4.1.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
 
-graphql@^0.12.3:
-  version "0.12.3"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-0.12.3.tgz#11668458bbe28261c0dcb6e265f515ba79f6ce07"
+graphql@^0.13.1:
+  version "0.13.1"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-0.13.1.tgz#9b3db3d8e40d1827e4172404bfdd2e4e17a58b55"
   dependencies:
-    iterall "1.1.3"
+    iterall "^1.2.0"
 
 growl@1.10.3:
   version "1.10.3"
@@ -2407,9 +2407,9 @@ istanbul@^0.4.0:
     which "^1.1.1"
     wordwrap "^1.0.0"
 
-iterall@1.1.3:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/iterall/-/iterall-1.1.3.tgz#1cbbff96204056dde6656e2ed2e2226d0e6d72c9"
+iterall@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/iterall/-/iterall-1.2.0.tgz#434e9f41f0b99911ab9c3d49d95f0e079176a2a2"
 
 js-tokens@^3.0.0, js-tokens@^3.0.2:
   version "3.0.2"