VKHS-1.9: CHANGELOG.md

Version 1.9
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* Disable Audio API due to upstream changes
* Handle re-login conditions
* Handle too-many-requests condition
* Stop re-exporting `Prelude`, `Imports` provides aliases for popular
  `Data.Text` functions
* Cache access token in file
* Minor fixes

Version 1.7.2
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* Initial support for runhaskell mode

Version 1.7.1
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* Support setting IDv2 tags for downloaded audio files
* CLI: Fix 'call' command output
* CLI: Fix 'music' command naming


Version 1.6.0
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* Use coroutine-based engine, offering smooth error handling
* Use pipes-http as network backend