chore(package): update concurrently to version 4.1.2

Closes #36

Author: greenkeeper[bot]

package.json

@@ -66,7 +66,7 @@
     "@types/node": "^9.4.6",
     "@types/winston": "^2.3.8",
     "codelyzer": "~4.1.0",
-    "concurrently": "^3.5.1",
+    "concurrently": "^4.1.2",
     "cookie-parser": "latest",
     "jasmine-core": "~3.0.0",
     "jasmine-spec-reporter": "~4.2.1",