Update README

Author: Hackerpilot

README.md

@@ -1,6 +1,6 @@
-Containers [![CI status](https://travis-ci.org/economicmodeling/containers.svg)](https://travis-ci.org/economicmodeling/containers/)
+Containers [![CI status](https://travis-ci.org/economicmodeling/containers.svg?branch=master)](https://travis-ci.org/economicmodeling/containers/)
 ==========
 
-Containers that do not use the GC.
+Containers backed by std.experimental.allocator
 
 Documentation is available at http://economicmodeling.github.io/containers/index.html