FIX include babel in npm package

Author: pubkey

.npmignore

@@ -6,7 +6,6 @@ docs-src/
 orga/
 test/
 test_tmp/
-babel.config.js
 .editorconfig
 .eslintrc.json
 .eslintignore
@@ -23,3 +22,7 @@ config.json
 perf.md
 log.txt
 processed.txt
+
+## Do not ignore the babel.config.js because
+## it is used in other packages like the premium package.
+# babel.config.js

src/plugins/worker/workers/webpack.config.js

@@ -32,7 +32,7 @@ module.exports = {
         cacheDirectory: path.resolve(
             projectRootPath,
             'test_tmp',
-            'webpack-cache'
+            'webpack-cache-worker'
         ),
     },
     devtool: 'source-map',