v0.6.7

• Update memoist dependency to ~> 0.16.

v0.6.6

• Remove ruby version warnings.

v0.6.5

• Fix incorrect http verb when revoking credentials.
• Warn on EOL ruby versions.

v0.6.4

• fix CLIENT_ID_VAR reference in DefaultCredentials per #153

v0.6.3

• Resolve issue where token_store was being written to twice
• Add warning when using cloud sdk credentials