Update version and CHANGELOG for 1.2.0

Author: Cleptomania

CHANGELOG.md

@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+## [1.2.0] - 2021-02-21
+
+### Changed
+
+-   Made zstd support optional. zstd support can be installed with `pip install pytiled-parser[zstd]`. PyTiled will raise a ValueError explaining to do this if you attempt to use zstd compression without support for it installed. This change is due to the zstd library being a heavy install and a big dependency to make mandatory when most people probably won't ever use it, or can very easily convert to using gzip or zlib for compression.
+
 ## [1.1.0] - 2021-02-21
 
 ### Added

pytiled_parser/version.py

@@ -1,3 +1,3 @@
 """pytiled_parser version"""
 
-__version__ = "1.1.0"
+__version__ = "1.2.0"