build: Add direct dependencies

Author: jpmckinney

setup.py

@@ -60,6 +60,9 @@
         'agate-excel>=0.2.2',
         'agate-dbf>=0.2.2',
         'agate-sql>=0.5.3',
+        'openpyxl',
+        'sqlalchemy',
+        'xlrd',
         # “selectable” entry points were introduced in Python 3.10.
         # https://docs.python.org/3/library/importlib.metadata.html
         'importlib_metadata; python_version < "3.10"',