Add travis & crates.io badges to readme

diff --git a/README.md b/README.md
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 A Set of bits.
 
 Documentation is available at https://contain-rs.github.io/bit-set/bit_set.
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+[![Build Status](https://travis-ci.org/contain-rs/bit-set.svg?branch=master)](https://travis-ci.org/contain-rs/bit-set)
+[![crates.io](http://meritbadge.herokuapp.com/bit-set)](https://crates.io/crates/bit-set)