updated readme.md

Added apache commons codec to dependencies.

Author: jlaitinen

README.md

@@ -4,6 +4,7 @@ java-sdk
 SDK for NFleet optimization services.
  - Dependencies
   - Gson (https://code.google.com/p/google-gson/)
+  - Apache Commons Codec for Base64 encoding (http://commons.apache.org/proper/commons-codec/)
   - For running unit tests junit (junit.org)
 
 2013-11-13