v0.7.0

* Update to postgres 0.12
* Alter dimension types to match postgres's

Update byteorder version

* Implement FromSql for T, not Option<T>

* Bump postgres version

* Accept byteorder 0.4

* Extend postgres version constraint.

Merge branch 'release-v0.5.0' into release

Release v0.4.2

Release v0.4.1