fix typo in config.clj

Release 0.15.0

Instrumentation

Fix over eager date parsing

save and cancel should have the same text color

initial multi-series documentation

increase ttl to 6 hours on pool and revert min pool size to 1

move the connection pool settings for sql drivers back.  new settings were making things worse regarding proliferation of unused connections.

Write docstrings for remaining public vars in Metabase 

Add some docstrings to things that are missing them 

Workaround BigQuery NULL value bug 

avoid issue where BQ queries fail trying to connect to a local postgres in order to build SQL.

0.15 docs