move license badge to the end

Author: newpavlov

README.md

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 # RustCrypto: Key Derivation Functions
 
-[![Project Chat][chat-image]][chat-link] ![Apache2/MIT licensed][license-image] [![dependency status][deps-image]][deps-link]
+[![Project Chat][chat-image]][chat-link] [![dependency status][deps-image]][deps-link] ![Apache2/MIT licensed][license-image]
 
 Collection of [Key Derivation Functions][KDF] (KDF) written in pure Rust.