Bump AWX version, after notable inventory deprecation

CHANGELOG.md

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 This is a list of high-level changes for each release of AWX. A full list of commits can be found at `https://github.com/ansible/awx/releases/tag/<version>`.
 
+## 13.0.0 (Jun 19, 2020)
+- Removed scripts as a means of running inventory updates of built-in types (https://github.com/ansible/awx/pull/6911)
+- Ansible 2.8 is now unsupported. Some inventory source types are known to no longer work.
+- Fixed an issue where the vmware inventory source ssl_verify source variable was not recognized (https://github.com/ansible/awx/pull/7360)
+
 ## 12.0.0 (Jun 9, 2020)
 - Removed memcached as a dependency of AWX (https://github.com/ansible/awx/pull/7240) 
 - Moved to a single container image build instead of separate awx_web and awx_task images. The container image is just `awx` (https://github.com/ansible/awx/pull/7228)

VERSION

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-12.0.0
+13.0.0

awxkit/VERSION

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-12.0.0
+13.0.0