CHANGELOG.md: New file.

CHANGELOG.md

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+## v0.9.0
+* Appraise can now generate 'appraisal plots'
+* Use of smafa / SQLite rather than BLAST+ / VSEARCH for 'query' and clustering. SingleM
+  databases (.sdb) will need to be regenerated.
+* SingleM databases can now be queried via taxonomy or sample name
+* Overhaul of command line help messages
+* Appraise can now appraise assemblies as well as genomes
+* Various bug fixes and enhancements
+
+## v0.8.2
+* Fix for installation through PyPI.
+
+## v0.8.1
+* Fix bug in singlem query where some results were omitted.
+* Detect when max_target_seqs has been reached in singlem query.
+
+## v0.8.0
+* Overhauled makedb/query. Database creation is now faster and querying more accurate, especially for OTUs with gaps. Old databases should be re-generated.
+* summarise: Added BIOM and wide format outputs - props to Steve Robbins and Louis Monaghan for the suggestions.
+* appraise: Default to genus-level similarity cutoff.
+
+## v0.7.1
+* Now installable via pip / PyPI.
+
+## v0.7.0
+* Speed improvements for singlem query
+* Memory improvements for singlem makedb
+* db: Use and require the new diamond version / database format
+* summarise: Only output to a single html for --krona where possible
+