npm pkg fix

Normalized repository.url as recommended in an `npm publish`

Author: quittle

package.json

@@ -9,7 +9,7 @@
     ],
     "repository": {
         "type": "git",
-        "url": "https://github.com/quittle/s3-upload-custom-resource-lambda-layer.git"
+        "url": "git+https://github.com/quittle/s3-upload-custom-resource-lambda-layer.git"
     },
     "scripts": {
         "build": "webpack",