fix(package): update connection-string to version 0.5.1

Closes #20

Author: greenkeeper[bot]

package.json

@@ -55,7 +55,7 @@
     "del-cli": "^1.1.0",
     "class-transformer": "^0.1.8",
     "class-validator": "^0.8.0",
-    "connection-string": "^0.4.1",
+    "connection-string": "^0.5.1",
     "dotenv": "^5.0.0",
     "jsonwebtoken": "^8.1.0",
     "node-django-hashers": "^1.0.9",