chore(package): add @types/webpack-env as dev dependency

Author: tiagoschenkel

package.json

@@ -71,6 +71,7 @@
     "@types/chai": "^4.1.7",
     "@types/mocha": "^5.2.5",
     "@types/sinon": "^5.0.7",
+    "@types/webpack-env": "^1.13.6",
     "bluebird": "^3.5.3",
     "browserify-versionify": "^1.0.6",
     "chai": "^4.2.0",

yarn.lock

@@ -143,6 +143,11 @@
   resolved "https://registry.npmjs.org/@types/sinon/-/sinon-5.0.7.tgz#0d9f89dd0c9988c4f1505a92a3a324ee7bdb18a6"
   integrity sha512-opwMHufhUwkn/UUDk35LDbKJpA2VBsZT8WLU8NjayvRLGPxQkN+8XmfC2Xl35MAscBE8469koLLBjaI3XLEIww==
 
+"@types/webpack-env@^1.13.6":
+  version "1.13.6"
+  resolved "http://registry.npmjs.org/@types/webpack-env/-/webpack-env-1.13.6.tgz#128d1685a7c34d31ed17010fc87d6a12c1de6976"
+  integrity sha512-5Th3OsZ4gTRdr9Mho83BQ23cex4sRhOR4XTG+m+cJc0FhtUBK9Vn62hBJ+pnQYnSxoPOsKoAPOx6FcphxBC8ng==
+
 "@webassemblyjs/[email protected]":
   version "1.7.11"
   resolved "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.7.11.tgz#b988582cafbb2b095e8b556526f30c90d057cace"