Merge pull request #2 from delphinus/feature/add-badges

Add badges

README.md

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 # RandomString -- Library to make passwords without misleading letters
 
+[![CircleCI](https://circleci.com/gh/delphinus/random-string.svg?style=svg)](https://circleci.com/gh/delphinus/random-string)
+[![Coverage Status](https://coveralls.io/repos/github/delphinus/random-string/badge.svg)](https://coveralls.io/github/delphinus/random-string)
+
 This package makes random passwords with fast logic described in [this link][].
 
 [this link]: http://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-golang