bump version to 0.2.0 (#2)

Author: nhz2

Project.toml

@@ -2,7 +2,7 @@ name = "CodecZlibNG"
 uuid = "642d12eb-acb5-4437-bcfc-a25e07ad685c"
 license = "MIT"
 authors = ["Tomas Drvostep <tomas.drvostep@gmail.com>", "Kenta Sato <bicycle1885@gmail.com>"]
-version = "0.2.0-dev"
+version = "0.2.0"
 
 [deps]
 TranscodingStreams = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"