updated dependency handling

requirements.txt

-esgfdownload
 esgf-pyclient==0.2.1
 MyProxyClient==2.1.0
-netCDF4==1.5.3
-urllib3==1.25.9
-xarray==0.15.1
-xmltodict==0.12.0
-shapely==1.7.0
-pyproj==2.6.1.post1
-dask==2.18.1
-toolz==0.10.0
+netCDF4>=1.5.4
+urllib3>=1.25.9
+xarray>=0.13.0
+xmltodict>=0.12.0
+shapely>=1.7.0
+pyproj>=2.6.1.post1
+dask>=2.0.0
+toolz>=0.10.0
 

setup.py

@@ -11,14 +11,18 @@ setup(
     keywords=['digital-earth', 'esgf', 'download', 'gfz', 'gerics'],
     url='https://git.gerics.de/digital-earth/de-esgf-download',
     install_requires=[
-        'esgf-pyclient',
-        'MyProxyClient',
-        'netCDF4',
-        'urllib3',
-        'xarray',
-        'xmltodict',
-        ],
+        'esgf-pyclient==0.2.1',
+        'MyProxyClient==2.1.0',
+        'netCDF4>=1.5.4',
+        'urllib3>=1.25.9',
+        'xarray>=0.13.0',
+        'xmltodict>=0.12.0',
+        'shapely>=1.7.0',
+        'pyproj>=2.6.1.post1',
+        'dask>=2.0.0',
+        'toolz>=0.10.0',
+    ],
     setup_requires=[
         'wheel'
-        ]
+    ]
 )