build: add release tools to dev deps

Author: JaKXz

package.json

@@ -39,7 +39,9 @@
   "devDependencies": {
     "chai": "^3.5.0",
     "chai-as-promised": "^6.0.0",
+    "conventional-github-releaser": "^1.1.3",
     "coveralls": "^2.11.14",
+    "dotenv": "^4.0.0",
     "memory-fs": "^0.4.1",
     "mocha": "^3.1.0",
     "npm-install-version": "^6.0.1",