Update MSRV in crate description

We updated the MSRV but omitted to update the crate description string.

Author: tcharding

Cargo.toml

@@ -3,7 +3,7 @@ name = "bitcoin_hashes"
 version = "0.11.0"
 authors = ["Andrew Poelstra <[email protected]>"]
 license = "CC0-1.0"
-description = "Hash functions used by rust-bitcoin which support rustc 1.29.0"
+description = "Hash functions used by rust-bitcoin which support rustc 1.41.1"
 homepage = "https://github.com/rust-bitcoin/bitcoin_hashes/"
 repository = "https://github.com/rust-bitcoin/bitcoin_hashes/"
 documentation = "https://docs.rs/bitcoin_hashes/"