Added recent changes

Author: terrytangyuan

CHANGES.md

@@ -2,7 +2,10 @@ Scikit Flow Change Log
 =================
 
 ## Development Version (master branch)
-* Performance and session related configurations, e.g. `num_cores`, `gpu_memory_fraction`, can now be wrapped in a ConfigAddon object and then passed into estimator. Example is available. 
+* Performance and session related configurations, e.g. `num_cores`, `gpu_memory_fraction`, can now be wrapped in a ConfigAddon object and then passed into estimator. Example is available.
+* Added Monitor support mimicking scikit-learn that allows various monitoring tasks, e.g. loss for a validation set.
+* Prediction for multi-class classification in estimator is more memory efficient for large number of classes.
+* Various bug fixes: #108, #114, #109
 
 ## v0.1.0 (Feb 13th, 2016)