Revert "Added preinstall script"

This reverts commit 8f0390ce24.

package.json

@@ -13,8 +13,7 @@
   ],
   "scripts": {
     "test": "cross-env TS_NODE_PROJECT='./tests/tsconfig.json' mocha --require ts-node/register ./tests/**/*-spec.ts",
-    "build": "tsc",
-    "preinstall": "npm install && npm run build"
+    "build": "tsc"
   },
   "keywords": [
     "RSS",