Remove manual preversion / postversion scripts (use np instead).

Author: Robert Jackson

package.json

@@ -7,9 +7,7 @@
     "ember-module-migrator": "./bin/ember-module-migrator"
   },
   "scripts": {
-    "test": "mocha test/*-test.js test/**/*-test.js",
-    "preversion": "npm test",
-    "postversion": "git push && git push --tags && npm publish"
+    "test": "mocha test/*-test.js test/**/*-test.js"
   },
   "author": "Robert Jackson <[email protected]>",
   "license": "MIT",