Remove engine check.

Caused problems with package installation.

Author: RubenVerborgh

.check-engine-version

@@ -24,7 +24,6 @@
   ],
   "license": "MIT",
   "scripts": {
-    "postinstall": "node .check-engine-version",
     "start:lib": "webpack-dev-server --env development --config=./webpack/webpack.lib.config.js",
     "start:demo": "webpack-dev-server --env development --config=./webpack/webpack.demo.config.js",
     "start:popup": "webpack-dev-server --env development --config=./webpack/webpack.popup.config.js",
@@ -93,7 +92,6 @@
     "prettier": "^1.5.3",
     "prettier-eslint": "^8.8.1",
     "rsa-pem-to-jwk": "^1.1.3",
-    "semver": "^5.5.1",
     "style-loader": "^0.23.0",
     "webpack": "^4.20.2",
     "webpack-cli": "^3.1.1",