Remove trailing whitespace

README.markdown

diff --git a/README.markdown b/README.markdown
index d1c9143..e9a4dfb 100644
--- a/README.markdown
+++ b/README.markdown
@@ -71,7 +71,7 @@
     nvm install unstable
     nvm use stable
     nvm run unstable --version
-    
+
 If you want to install `io.js`:
 
     nvm install iojs