chore: Bump version to 2.2.1

Author: sile

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libflate"
-version = "2.2.0"
+version = "2.2.1"
 authors = ["Takeru Ohta <phjgt308@gmail.com>"]
 description = "A Rust implementation of DEFLATE algorithm and related formats (ZLIB, GZIP)"
 homepage = "https://github.com/sile/libflate"