added check if package is being installed as a dependency

Author: emin93

setup.js

@@ -1,6 +1,10 @@
 const fs = require('fs')
 const path = require('path')
 
+if (fs.existsSync(path.join(__dirname, '.travis.yml'))) {
+  process.exit()
+}
+
 const projectFilesToDelete = ['.flowconfig', 'App.js', '__tests__/App-test.js']
 
 const templateFilesToDelete = ['setup.js', 'README.md', 'LICENSE']