chore(package): update aws-sdk-mock to version 5.1.0

Closes #40

Author: greenkeeper[bot]

package.json

@@ -55,7 +55,7 @@
     "@types/validator": "^10.11.2",
     "@typescript-eslint/eslint-plugin": "^1.13.0",
     "@typescript-eslint/parser": "^1.13.0",
-    "aws-sdk-mock": "^4.5.0",
+    "aws-sdk-mock": "^5.1.0",
     "chai": "^4.2.0",
     "eslint": "^5.0.0",
     "eslint-config-airbnb-typescript": "^4.0.1",