Update README.md

Author: pgleeson

README.md

@@ -2,7 +2,7 @@
 
 C++ API for NeuroML 2
 
-**Work in progress!** See https://github.com/NeuroML/NeuroML2/issues/102.
+**Work in progress, but usable.** See https://github.com/NeuroML/NeuroML2/issues/102.
 
 ## Using the API
 
@@ -75,4 +75,4 @@ repository.
 [cpack documentation]: https://cmake.org/cmake/help/v3.5/manual/cpack.1.html
 [Xerces C++]: http://xerces.apache.org/xerces-c/
 
-[![Build Status](https://travis-ci.org/NeuroML/NeuroML_API.svg?branch=master)](https://travis-ci.org/NeuroML/NeuroML_API)
+[![Build Status](https://travis-ci.org/NeuroML/NeuroML_API.svg?branch=master)](https://travis-ci.org/NeuroML/NeuroML_API)