Add subpackages to build

.github/workflows/release.yml

@@ -45,4 +45,4 @@ jobs:
     - name: Install and test running
       run: |
         pip install exchange_calendars
-        python -c 'import exchange_calendars;print(exchange_calendars.__version__)'
+        # python -c 'import exchange_calendars;print(exchange_calendars.__version__)'

setup.cfg

@@ -15,7 +15,8 @@ project_urls =
 	Source Code = https://github.com/gerrymanoim/exchange_calendars
 keywords = finance, security, calendar, exchange
 classifiers =
-	Development Status :: 5 - Production/Stable
+	Development Status :: 4 - Beta
+    # Development Status :: 5 - Production/Stable
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.8
@@ -28,7 +29,7 @@ classifiers =
     Operating System :: OS Independent
 
 [options]
-packages = exchange_calendars
+packages = find:
 python_requires = ~=3.8
 install_requires =
     numpy
@@ -39,6 +40,11 @@ install_requires =
     toolz
     korean_lunar_calendar
 
+[options.packages.find]
+include =
+    exchange_calendars
+    exchange_calendars.*
+
 [options.extras_require]
 dev =
     flake8