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|  | Optionally, removed the "Happy Pride Month" at the end of the docstring because it will be shown in the announcement automatically through the greeting attribute (shown as embed author). | 
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|  | This allows the cache to be leveraged for these commands, and thus may
also avoid pushing/pulling extra layers.
* Remove LIBRARY_PATH environment variable | 
|  | pip has to be at least version 19.0.2, which fixes a
have_directory_for_build AssertionError when installing with
PIP_NO_CACHE_DIR set. The updated image comes with pip 19.0.3.
See pypa/pip#6219 for more info. | 
|  | freetype-dev is required for loading fonts with pillow.
* Remove zlib as zlib-dev installs zlib anyway | 
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|  | Docker implemented this feature using tini too. Requires Docker Engine
18.06 or higher. |