Remove trailing whitespace

README.md

@@ -15,7 +15,7 @@ observations. It offers flexible evaluation code that users can easily adapt
 according to their needs. It is build on a modern software stack using Python3
 and Met+ in a conda environment to support portability. Clear documentation,
 working practices, automatic testing, and open access ensure developers can
-easily use and contribute to this system. 
+easily use and contribute to this system.
 
 Please read [the documentation](https://metoffice.github.io/CSET) to learn more
 about CSET, and how to use it.