Update dependency core-js to v2.5.6

Author: renovate-bot

basic/package.json

@@ -25,7 +25,7 @@
     "angular2-moment": "1.9.0",
     "apollo-angular": "0.13.3",
     "apollo-client": "1.9.3",
-    "core-js": "2.5.5",
+    "core-js": "2.5.6",
     "graphql-config-parser": "1.2.1",
     "graphql-tag": "1.3.2",
     "rxjs": "5.5.10",

basic/yarn.lock

@@ -1238,9 +1238,9 @@ copy-webpack-plugin@~4.4.1:
     p-limit "^1.0.0"
     serialize-javascript "^1.4.0"
 
-[email protected].5:
-  version "2.5.5"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.5.5.tgz#b14dde936c640c0579a6b50cabcc132dd6127e3b"
+[email protected].6:
+  version "2.5.6"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.5.6.tgz#0fe6d45bf3cac3ac364a9d72de7576f4eb221b9d"
 
 core-js@^2.4.0:
   version "2.4.1"