message: Update changelog for 5.3.1 release
diff: @@ -11,14 +11,14 @@ tag versions. The Bond compiler (`gbc`) and
  different versioning scheme, following the Haskell community's
  [package versioning policy](https://wiki.haskell.org/Package_versioning_policy).
  -## Unreleased ##
  -
  -* `gbc` & compiler library: TBD
  -* IDL core version: TBD
  -* IDL comm version: TBD
  -* C++ version: TBD
  -* C# NuGet version: TBD (bug fix bump needed)
  -* C# Comm NuGet version: TBD (bug fix bump needed due to dependencies)
  +## 5.3.1: 2017-04-25 ##
  +
  +* `gbc` & compiler library: 0.9.0.0
  +* IDL core version: 2.0
  +* IDL comm version: 1.2
  +* C++ version: 5.3.0
  +* C# NuGet version: 5.3.1
  +* C# Comm NuGet version: 0.11.1
  ### C# ###
  