Merge pull request dart-archive/crypto#28 from Pacane/patch-1

added HMAC to the README

Author: sethladd

pkgs/crypto/README.md

@@ -5,6 +5,7 @@ A set of cryptographic functions implemented in pure Dart.
 * MD5
 * SHA1
 * SHA265
+* HMAC
 * Converting a list of bytes into a hex string
 * Converting a list of bytes into a base64-encoded string.
 * Converting a Base 64 encoded String into list of bytes.