README: add some whitespace

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README.md

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 [enforce]:  http://aantron.github.io/better-enums/demo/SpecialValues.html
 [project]:  http://aantron.github.io/better-enums
 
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 ## Installation
 
 Simply add `enum.h` to your project.
 
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 ## Additional features
 
 - Uses only standard C++, though, for C++98, variadic macro support is required
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 [testing]:     http://aantron.github.io/better-enums/CompilerSupport.html
 [performance]: http://aantron.github.io/better-enums/Performance.html
 
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 ## Limitations
 
 The biggest limitation is that the `BETTER_ENUM` macro can't be used inside a
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 [nested]: http://aantron.github.io/better-enums/DesignDecisionsFAQ.html#NoEnumInsideClass
 [extend]: http://aantron.github.io/better-enums/ExtendingLimits.html
 
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 ## Contact and development
 
 Don't hesitate to contact me about features or bugs:
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 [email]:        mailto:antonbachin@yahoo.com
 [contributing]: https://github.com/aantron/better-enums/blob/master/doc/CONTRIBUTING.md
 
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 ## License and history
 
 Better Enums is released under the BSD 2-clause license. See