Compile to dist/ folder on npm publish only

We distribute the dist folder as part of the npm package; no need to
compile again when a user installs the library.

Author: rylnd

package.json

@@ -10,7 +10,7 @@
     "dev": "concurrently --kill-others --prefix=name --names=server,eslint --prefix-colors=green,magenta \"babel-watch --watch src src/server.js\" \"esw src/ --changed --watch\"",
     "start": "babel-node src/server.js",
     "start:prod": "node dist/server.js",
-    "prepare": "babel src/ --out-dir=dist/ --copy-files"
+    "prepublishOnly": "babel src/ --out-dir=dist/ --copy-files"
   },
   "author": "",
   "license": "MIT",