fix remaining formating issue on CHANGELOG

Author: hadim

CHANGELOG.md

@@ -362,7 +362,6 @@ memory utilization
 
 - None
 
-
 ## [0.4.4] - 2019-08-12
 
 ### Added
@@ -410,7 +409,6 @@ memory utilization
 
 - Fixed a bug where accumulate gradients would scale the loss incorrectly
 
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 ## [0.4.2] - 2019-08-08
 
 ### Added
@@ -455,7 +453,6 @@ memory utilization
 
 - None
 
-
 ## [0.4.0] - 2019-08-08
 
 ### Added
@@ -479,7 +476,6 @@ memory utilization
 
 - Fixed issues with reducing outputs from generative models (such as images and text)
 
-
 ## [0.3.6.1] - 2019-07-27
 
 ### Added