v0.3.0

Changelog

a8f7c02 release version 0.3.0
c8ff1da add Exists function to user object (#30)
b35b361 Enable support for externalbrowser Authenticator (#28)
fce3a63 hack to deal with snowflake including quotes in names (#29)
5dfffe3 basic doc on authentication
a4c8708 need to close sql.Rows (#25)
1ca0e76 cleanup resources (#24)
ef00d2c add more fields to user (#23)
664fbe2 [breaking] make snowflake_role_grants exclusive, remove name (#22)
a399c0f parallel tests (#20)
37ea834 minor fixes from lint issues (#21)