Add v1.2.1 changelog

docs/conf.py

@@ -74,9 +74,9 @@ author = "caner & inso & vit"
 # built documents.
 #
 # The short X.Y version.
-version = "1.2.0"
+version = "1.2.1"
 # The full version, including alpha/beta/rc tags.
-release = "1.2.0"
+release = "1.2.1"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.