postgis 0.6.0

An extension to rust-postgres, adds support for PostGIS.
Documentation 
## 0.6.0 (2018-03-17)

* Support for Geometry and GeometryCollection

## 0.5.0 (2017-08-21)

* Update to postgres 0.15
* Make error module public

## 0.4.0 (2017-03-04)

* Update to postgres 0.14

## 0.3.0 (2016-12-05)

* EWKB/PostGIS output based on generic geometry traits
* Support for Tiny WKB (TWKB) geometries
* Unit tests for all geometry types

## 0.2.2 (2016-09-05)

* Update to postgres 0.11