Phil Freeman 94102c0460 Add downgrade command (close #1156) (#3760) ... * Add downgrade command * Add docs per @lexi-lambda's suggestions * make tests pass * Update hdb_version once, from Haskell * more work based on feedback * Improve the usage message * Small docs changes * Test downgrades exist for each tag * Update downgrading.rst * Use git-log to find tags which are ancestors of the current commit Co-authored-by: Vamshi Surabhi <0x777@users.noreply.github.com>		2020-02-07 16:33:12 +05:30
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Main.hs	Add downgrade command (close #1156) (#3760)	2020-02-07 16:33:12 +05:30