Bumping to Release v.0.3.0

Features include:
Python 3.6 Lambda support
Caching of the KMS decrypted CA Private Key Password.
Compressed CA Private Key support, allowing RSA 4096 keys to be set in the Lambda Environment.
Issue certificates for ED25519 public keys (RSA CA).
New option to validate the remote username against the IAM groups of the calling user.
Updated dependencies.

bless/__about__.py

@@ -9,7 +9,7 @@
     "sign SSH public keys.")
 __uri__ = "https://github.com/Netflix/bless"
 
-__version__ = "0.2.0"
+__version__ = "0.3.0"
 
 __author__ = "The BLESS developers"
 __email__ = "[email protected]"