conflict with mini-css-extract-plugin < 0.10.0

[jansenchan]

when i use the fllow plugins:

• webpack-retry-chunk-load-plugin@2.2.0
• mini-css-extract-plugin@0.9.0

I got this error:

please add semicolon to prevent the conflict, like:

return (
  ';' 
  + source 
  + prettier.format(script, { 
    trailingComma: 'es5', 
    singleQuote: true, 
    parser: 'babel' 
  })
  + ';'
);

[bluthen]

Related to #53 mini-css-extract-plugin 0.9.0 is missing a semicolon. It looks like the semicolon is there in their latest 2.7.6. Not sure what the lowest version it was added in, but it seems fixed in a newer version of mini-css-extract-plugin.