README: add travis badge

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 # spake2.rs
 the SPAKE2 password-authenticated key-exchange algorithm, in Rust
 
+[![Build Status](https://travis-ci.org/warner/spake2.rs.svg?branch=master)](https://travis-ci.org/warner/spake2.rs)
+
 NOTE: this is just a beginning: you should absolutely not use this for anything at all yet. It has a long way to go. Wait until it has a real version number and has been published to crates.io.