Merge pull request opencensus-integrations#43 from otternq/record-cal…

…l-stats

observability: fix err access scope to correctly retrieve it on defer

Release v0.1.5

Release v0.1.4

Merge pull request opencensus-integrations#28 from opencensus-integra…

…tions/add-stats

adds stats to ocsql

Merge pull request opencensus-integrations#27 from opencensus-integra…

…tions/implement-extra-row-interfaces

Implement additional driver.Rows interfaces

unhide optional interfaces for Conn wrapping (opencensus-integrations#18

)

Interface enhancements (opencensus-integrations#13)

* make options.DefaultAttributes immutable
* add support for DriverContext, Connector, SessionResetter, NamedValueChecker and ColumnConverter
* add travis ci