Update dependency core-js to v2.5.4

Author: renovate-bot

basic/package.json

@@ -25,7 +25,7 @@
     "angular2-moment": "1.8.0",
     "apollo-angular": "0.13.3",
     "apollo-client": "1.9.3",
-    "core-js": "2.5.3",
+    "core-js": "2.5.4",
     "graphql-config-parser": "1.2.1",
     "graphql-tag": "1.3.2",
     "rxjs": "5.5.8",

basic/yarn.lock

@@ -1238,9 +1238,9 @@ copy-webpack-plugin@~4.4.1:
     p-limit "^1.0.0"
     serialize-javascript "^1.4.0"
 
-core-js@2.5.3:
-  version "2.5.3"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.5.3.tgz#8acc38345824f16d8365b7c9b4259168e8ed603e"
+core-js@2.5.4:
+  version "2.5.4"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.5.4.tgz#f2c8bf181f2a80b92f360121429ce63a2f0aeae0"
 
 core-js@^2.4.0:
   version "2.4.1"