v2.9.0+3

• Add --context NUM flag to helm diff upgrade, helm diff rollback and helm diff revision command (#29)
• Fix plugin installation on helm --debug plugin install (#62)
• Dedicated exit code, 2, when diff exists (#65, #78)
• Specify --version to avoid the GH API limit while installing the plugin (#69)
• TLS-based client auth support (#71)
• Support for diff of changes in chart hooks (#72)
• Improved diff on apiVersion changes (#73)
• Add --set-string K=V to helm diff upgrade (#84)
• Fixed wrong diffs on namespaced release (#41). Also use the newly added --namespace NS flag for helm diff upgrade (#85)