move badges below readme header

Author: newpavlov

README.md

@@ -1,4 +1,6 @@
-# RustCrypto: Message Authentication Codes [![Project Chat][chat-image]][chat-link] [![dependency status][deps-image]][deps-link]
+# RustCrypto: Message Authentication Codes
+
+[![Project Chat][chat-image]][chat-link] [![dependency status][deps-image]][deps-link]
 
 Collection of [Message Authentication Code][1] (MAC) algorithms written in pure Rust.