Add test coverage for to byte decoding

Cargo.toml

@@ -27,6 +27,8 @@ zune-jpeg = { version = "0.4.17", optional = true }
 
 [dev-dependencies]
 criterion = "0.3.1"
+# We may already depend on this via flate2
+crc32fast = "1"
 
 [features]
 default = ["deflate", "jpeg", "lzw"]