v0.15.0

Changelog

787428a release version 0.15.0
49d7cab [feature] add extra properties to users
09df481 [fix] skip test broken by snowflake
4c48182 [feature] "WITH GRANT OPTION" in grants
cd67f0c [docs] added note about requiring acceptance tests
97d9a47 Snowflake throws an error now if you don't have a predecessor or schedule on a task (#241)
af48558 simplifycomposit lint cleanup (#238)
7edd15b [fix] escape some strings in query builders (#231)
0902b36 [fix] skip test broken by snowflake (#239)