Revert "Updating CHANGELOG for 1.3.1 release."

This reverts commit 751ddab98f78611a020f288f509306b8e39dc258.
diff --git a/CHANGELOG b/CHANGELOG
index 653b6d5..3f8e3ab 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,14 +1,3 @@
-Parquet C++ 1.3.1
---------------------------------------------------------------------------------
-## Bug
-    * [PARQUET-1105] - [CPP] Remove libboost_system dependency 
-    * [PARQUET-1123] - [C++] Update parquet-cpp to use Arrow's AssertArraysEqual
-    * [PARQUET-1121] - C++: DictionaryArrays of NullType cannot be written
-
-## Improvement
-    * [PARQUET-1070] - Add CPack support to the build
-
-
 Parquet C++ 1.3.0
 --------------------------------------------------------------------------------
 ## Bug