Add __init__.py to modules folder.

[davcri]

Fixes #76 for me.

It seems that the current setup.cfg detects python files only if the module is declared explicitly (by creating an __init__.py file).

Click to see output of `make build`

python3 setup.py sdist bdist_wheel
running sdist
running egg_info
writing gdscript_docs_maker/gdscript_docs_maker.egg-info/PKG-INFO
writing dependency_links to gdscript_docs_maker/gdscript_docs_maker.egg-info/dependency_links.txt
writing top-level names to gdscript_docs_maker/gdscript_docs_maker.egg-info/top_level.txt
reading manifest file 'gdscript_docs_maker/gdscript_docs_maker.egg-info/SOURCES.txt'
writing manifest file 'gdscript_docs_maker/gdscript_docs_maker.egg-info/SOURCES.txt'
running check
creating gdscript_docs_maker-1.3.0
creating gdscript_docs_maker-1.3.0/gdscript_docs_maker
creating gdscript_docs_maker-1.3.0/gdscript_docs_maker/gdscript_docs_maker.egg-info
creating gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
copying files to gdscript_docs_maker-1.3.0...
copying LICENSE -> gdscript_docs_maker-1.3.0
copying README.md -> gdscript_docs_maker-1.3.0
copying setup.cfg -> gdscript_docs_maker-1.3.0
copying setup.py -> gdscript_docs_maker-1.3.0
copying gdscript_docs_maker/gdscript_docs_maker.egg-info/PKG-INFO -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/gdscript_docs_maker.egg-info
copying gdscript_docs_maker/gdscript_docs_maker.egg-info/SOURCES.txt -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/gdscript_docs_maker.egg-info
copying gdscript_docs_maker/gdscript_docs_maker.egg-info/dependency_links.txt -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/gdscript_docs_maker.egg-info
copying gdscript_docs_maker/gdscript_docs_maker.egg-info/top_level.txt -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/gdscript_docs_maker.egg-info
copying gdscript_docs_maker/modules/__init__.py -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
copying gdscript_docs_maker/modules/command_line.py -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
copying gdscript_docs_maker/modules/config.py -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
copying gdscript_docs_maker/modules/convert_to_markdown.py -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
copying gdscript_docs_maker/modules/gdscript_objects.py -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
copying gdscript_docs_maker/modules/hugo.py -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
copying gdscript_docs_maker/modules/make_markdown.py -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
copying gdscript_docs_maker/modules/merge_json.py -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
copying gdscript_docs_maker/modules/utils.py -> gdscript_docs_maker-1.3.0/gdscript_docs_maker/modules
Writing gdscript_docs_maker-1.3.0/setup.cfg
Creating tar archive
removing 'gdscript_docs_maker-1.3.0' (and everything under it)
running bdist_wheel
running build
running build_py
creating build
creating build/lib
creating build/lib/modules
copying gdscript_docs_maker/modules/convert_to_markdown.py -> build/lib/modules
copying gdscript_docs_maker/modules/__init__.py -> build/lib/modules
copying gdscript_docs_maker/modules/make_markdown.py -> build/lib/modules
copying gdscript_docs_maker/modules/merge_json.py -> build/lib/modules
copying gdscript_docs_maker/modules/utils.py -> build/lib/modules
copying gdscript_docs_maker/modules/hugo.py -> build/lib/modules
copying gdscript_docs_maker/modules/command_line.py -> build/lib/modules
copying gdscript_docs_maker/modules/gdscript_objects.py -> build/lib/modules
copying gdscript_docs_maker/modules/config.py -> build/lib/modules
installing to build/bdist.linux-x86_64/wheel
running install
running install_lib
creating build/bdist.linux-x86_64
creating build/bdist.linux-x86_64/wheel
creating build/bdist.linux-x86_64/wheel/modules
copying build/lib/modules/convert_to_markdown.py -> build/bdist.linux-x86_64/wheel/modules
copying build/lib/modules/__init__.py -> build/bdist.linux-x86_64/wheel/modules
copying build/lib/modules/make_markdown.py -> build/bdist.linux-x86_64/wheel/modules
copying build/lib/modules/merge_json.py -> build/bdist.linux-x86_64/wheel/modules
copying build/lib/modules/utils.py -> build/bdist.linux-x86_64/wheel/modules
copying build/lib/modules/hugo.py -> build/bdist.linux-x86_64/wheel/modules
copying build/lib/modules/command_line.py -> build/bdist.linux-x86_64/wheel/modules
copying build/lib/modules/gdscript_objects.py -> build/bdist.linux-x86_64/wheel/modules
copying build/lib/modules/config.py -> build/bdist.linux-x86_64/wheel/modules
running install_egg_info
Copying gdscript_docs_maker/gdscript_docs_maker.egg-info to build/bdist.linux-x86_64/wheel/gdscript_docs_maker-1.3.0-py3.8.egg-info
running install_scripts
creating build/bdist.linux-x86_64/wheel/gdscript_docs_maker-1.3.0.dist-info/WHEEL
creating 'dist/gdscript_docs_maker-1.3.0-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
adding 'modules/__init__.py'
adding 'modules/command_line.py'
adding 'modules/config.py'
adding 'modules/convert_to_markdown.py'
adding 'modules/gdscript_objects.py'
adding 'modules/hugo.py'
adding 'modules/make_markdown.py'
adding 'modules/merge_json.py'
adding 'modules/utils.py'
adding 'gdscript_docs_maker-1.3.0.dist-info/LICENSE'
adding 'gdscript_docs_maker-1.3.0.dist-info/METADATA'
adding 'gdscript_docs_maker-1.3.0.dist-info/WHEEL'
adding 'gdscript_docs_maker-1.3.0.dist-info/top_level.txt'
adding 'gdscript_docs_maker-1.3.0.dist-info/RECORD'
removing build/bdist.linux-x86_64/wheel         

Please check if the PR fulfills these requirements:

• The commit message follows our guidelines.
• For bug fixes and features:
  • You tested the changes.
  • You updated the docs or changelog.

[NathanLovato]

Thanks!