chore(package): update concurrently to version 5.2.0

Closes #72

Author: greenkeeper[bot]

package.json

@@ -84,7 +84,7 @@
     "camelcase": "^4.0.0",
     "codecov": "^2.2.0",
     "codelyzer": "^3.0.1",
-    "concurrently": "^3.4.0",
+    "concurrently": "^5.2.0",
     "core-js": "^2.4.1",
     "execa": "^0.7.0",
     "glob": "^7.1.1",