Update dependency rxjs to v5.5.7

Author: renovate-bot

basic/package.json

@@ -28,7 +28,7 @@
     "core-js": "2.5.3",
     "graphql-config-parser": "1.2.1",
     "graphql-tag": "1.3.2",
-    "rxjs": "5.5.6",
+    "rxjs": "5.5.7",
     "ts-helpers": "1.1.2",
     "zone.js": "0.8.20"
   },

basic/yarn.lock

@@ -4534,7 +4534,13 @@ run-queue@^1.0.0, run-queue@^1.0.3:
   dependencies:
     aproba "^1.1.1"
 
-rxjs@5.5.6, rxjs@^5.5.6:
+rxjs@5.5.7:
+  version "5.5.7"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-5.5.7.tgz#afb3d1642b069b2fbf203903d6501d1acb4cda27"
+  dependencies:
+    symbol-observable "1.0.1"
+
+rxjs@^5.5.6:
   version "5.5.6"
   resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-5.5.6.tgz#e31fb96d6fd2ff1fd84bcea8ae9c02d007179c02"
   dependencies: