fixed __init__.py and updated setup.py

deprogressapi/__init__.py

-from progress_report import ProgressReport
-from send_handler_interface import FormalProgressInterface
\ No newline at end of file
+from .progress_report import ProgressReport
+from .send_handler_interface import FormalProgressInterface
\ No newline at end of file

setup.py

-from setuptools import setup
+from distutils.core import setup
 
 setup(
     name='deprogressapi',
@@ -13,7 +13,10 @@ setup(
     download_url='https://git.geomar.de/digital-earth/dasf/dasf-progress-api/-/archive/v0.1.0/dasf-progress-api-v0.1.0.tar.gz',
     install_requires=[
     ],
-    setup_requires=[
-        'wheel'
-    ]
+    classifiers=[
+        'Development Status :: 4 - Beta',      # Chose either "3 - Alpha", "4 - Beta" or "5 - Production/Stable" as the current state of your package
+        'Intended Audience :: Developers',      # Define that your audience are developers
+        'License :: OSI Approved :: Apache-2.0',   # Again, pick a license
+        'Programming Language :: Python :: 3.8',
+  ],
 )