Merge pull request #33 from emin93/fix-yarn-post-install

Fixed Yarn Post Install issue

setup.js

@@ -9,9 +9,17 @@ const projectFilesToDelete = ['.flowconfig', 'App.js', '__tests__/App-test.js']
 
 const templateFilesToDelete = ['setup.js', 'README.md', 'LICENSE']
 
+const deleteFile = filePath => {
+  if (!fs.existsSync(filePath)) {
+    return
+  }
+
+  fs.unlinkSync(filePath)
+}
+
 const projectPath = path.join(__dirname, '..', '..')
-const deleteProjectFile = fileName => fs.unlinkSync(path.join(projectPath, fileName))
-const deleteTemplateFile = fileName => fs.unlinkSync(path.join(__dirname, fileName))
+const deleteProjectFile = fileName => deleteFile(path.join(projectPath, fileName))
+const deleteTemplateFile = fileName => deleteFile(path.join(__dirname, fileName))
 
 projectFilesToDelete.forEach(deleteProjectFile)
 templateFilesToDelete.forEach(deleteTemplateFile)