Bump version 2.7.0 to 3.0.0.

Bump version: 2.5.0 → 2.6.0

Use binary psycopg2 packages (testcontainers#40)

Quoting its web page:
> The binary package is a practical choice for development and testing but in production it is advised to use the package built from sources.

For me right now, not having had to build psycopg2 from source would have made my life easier.

Update setup.py

Update setup.py

version pump to 2.2

setup.py github link fix

new api (testcontainers#5)

* GenericContainer added

* DockerContainer additional methods

* mysql environ variables added

* mysql environ variables added

* test for env variables added

* test for env variables fixed

* postgres fix

* postgres get_connection_url fix

* release process description changed

* with_name added to docker container class

* with_mount_volumes added to docker container

* test fix for port bindings

* with_exposed_ports added

* _configure deleted from DockerContainer class

* tests fix

* test fix for custom image