chore(package): update concurrently to version 5.2.0

Closes #70

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
     "@types/sinon": "^7.0.11",
     "@types/sinon-chai": "^3.2.2",
     "chai": "^4.2.0",
-    "concurrently": "^4.1.0",
+    "concurrently": "^5.2.0",
     "glob": "^7.1.3",
     "istanbul": "^0.4.5",
     "lolex": "^4.0.1",