do not copy package.json to lib

Author: jamiehodge

package.json

@@ -33,7 +33,7 @@
     "testonly": "babel-node ./node_modules/.bin/_mocha $npm_package_options_mocha",
     "lint": "eslint src",
     "check": "flow check",
-    "build": "rm -rf lib/* && babel src --ignore __tests__ --out-dir lib && cp package.json lib/ && npm run build:flow",
+    "build": "rm -rf lib/* && babel src --ignore __tests__ --out-dir lib && npm run build:flow",
     "build:flow": "find ./src -name '*.js' -not -path '*/__tests__*' | while read filepath; do cp $filepath `echo $filepath | sed 's/\\/src\\//\\/lib\\//g'`.flow; done",
     "watch": "babel-node scripts/watch.js",
     "cover": "babel-node node_modules/.bin/isparta cover --root src --report html node_modules/.bin/_mocha -- $npm_package_options_mocha",