Consistent format for syntax errors.

[andreypopp]

I used babel-code-frame package formatting syntax errors code frames. That makes it consistent with Babel output which is I think very important as it makes it less cognitive efforts to recognize and process the error.

You can also see that there's no duplicated filename in error message as webpack already print module name.

Before:

After:

See also:

• fix: more concise formatting for Babel errors babel/babel-loader#287
• Consistent format for CSS syntax errors postcss-loader#87

[codecov-io]

Current coverage is 98.34% (diff: 91.66%)

Merging #319 into master will increase coverage by 0.13%

@@             master       #319   diff @@
==========================================
  Files             9          9          
  Lines           280        303    +23   
  Methods          39         41     +2   
  Messages          0          0          
  Branches         60         66     +6   
==========================================
+ Hits            275        298    +23   
  Misses            5          5          
  Partials          0          0          

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[sokra]

awsome 👍. A test would be great 😄

[andreypopp]

@sokra done!

[sokra]

Thanks