[Rust] Bump recfarm version to 0.2.1 (#528)

Author: massquantity

rust/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "recfarm"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html