Update required Ansible version to 2.8+

Attempting to build the docker image with Ansible 2.5.1 results in the following error:
```
TASK [image_build : Build sdist builder image] *******************************************************************************************
fatal: [localhost -> localhost]: FAILED! => {"changed": false, "msg": "Unsupported parameters for (docker_image) module: build, force_source, source Supported parameters include: api_version, archive_path, buildargs, cacert_path, cert_path, container_limits, debug, docker_host, dockerfile, filter_logger, force, http_timeout, key_path, load_path, name, nocache, path, pull, push, repository, rm, ssl_version, state, tag, timeout, tls, tls_hostname, tls_verify, use_tls"}                                                                                 
```
The `force_source` parameter was added to docker_image in Ansible 2.8 (![source](https://docs.ansible.com/ansible/latest/modules/docker_image_module.html)).
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JensPfeifle 2019-11-03 19:03:40 +01:00 committed by GitHub
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@ -57,7 +57,7 @@ To install the assets, clone the `awx-logos` repo so that it is next to your `aw
Before you can run a deployment, you'll need the following installed in your local environment:
- [Ansible](http://docs.ansible.com/ansible/latest/intro_installation.html) Requires Version 2.4+
- [Ansible](http://docs.ansible.com/ansible/latest/intro_installation.html) Requires Version 2.8+
- [Docker](https://docs.docker.com/engine/installation/)
+ A recent version
- [docker](https://pypi.org/project/docker/) Python module