add build status now that build is configured

README.md

@@ -1,8 +1,9 @@
 rust-rocksdb
 ============
+[![Build Status](https://travis-ci.org/spacejam/rust-rocksdb.svg?branch=master)](https://travis-ci.org/spacejam/rust-rocksdb)
 
 rust-rocksdb has been tested with version 3.8.1 on linux and OSX.  Crate version 0.0.3 should work on the 1.0.0 alpha.
-###### Prerequisites
+###### Prerequisite: RocksDB
 ```bash
 wget https://github.com/facebook/rocksdb/archive/rocksdb-3.8.tar.gz
 tar xvf rocksdb-3.8.tar.gz && cd rocksdb-rocksdb-3.8 && make static_lib