Create 0.5.5 and 0.6.0

[burmanm]

• 0.5.5 should include old version of alerts + metrics fixes from 0.5.4
• 0.6.0 should include alerts 2.0.0 support

[burmanm]

0.5.5 is now the latest version in PyPi, supporting alerts 1.x series. From 0.6.0 the only supported alerts version is going to be 2.x