downgrad erequired python version to be compatible with airflow images

requirements.txt

@@ -9,4 +9,4 @@ apache-airflow-providers-http
 apache-airflow-providers-sftp
 python-dotenv
 --index-url https://gitlab.jsc.fz-juelich.de/api/v4/projects/4405/packages/pypi/simple
-airflow_datacat_integration
\ No newline at end of file
+airflow-datacat-integration
\ No newline at end of file

setup.cfg

 [metadata]
 name = airflow_datacat_integration
-version = 0.0.2
+version = 0.0.3
 author = Christian Boettcher
 author_email = c.boettcher@fz-juelich.de
 description = Datacatalog Integration for Apache Airflow
@@ -16,7 +16,7 @@ classifiers =
 
 [options]
 packages = datacat_integration
-python_requires = >=3.9
+python_requires = >=3.7
 
 [options.packages.find]
 where = src
\ No newline at end of file