Fix skipping of '__tests__' folder during Babel build

Author: IvanGoncharov

package.json

@@ -39,7 +39,7 @@
  "lint": "eslint src",
  "prettier": "prettier --write 'src/**/*.js'",
  "check": "flow check",
- "build": "rm -rf dist/* && babel src --ignore __tests__ --out-dir dist && npm run build:flow",
+ "build": "rm -rf dist/* && babel src --ignore '**/__tests__' --out-dir dist && npm run build:flow",
  "build:flow": "find ./src -name '*.js' -not -path '*/__tests__*' | while read filepath; do cp $filepath `echo $filepath | sed 's/\\/src\\//\\/dist\\//g'`.flow; done",
  "watch": "node resources/watch.js",
  "cover": "nyc npm run testonly",