* Update build

* Update to circleci 2.0
* Update Makefile to use Prometheus Makefile.common.
Signed-off-by: Ben Kochie <superq@gmail.com>

* Fix spelling typos.
Signed-off-by: Ben Kochie <superq@gmail.com>

* Add percona server to docker test.

* Run the latest percona-server docker image.
* Set a `mysql-test` docker network.
Signed-off-by: Ben Kochie <superq@gmail.com>

* Update Travis go versions.
Signed-off-by: Ben Kochie <superq@gmail.com>

* Update README

* Recommend docker network, as link is deprecated.
* Make DSN example more consistent.
Signed-off-by: Ben Kochie <superq@gmail.com>