Drop py37 support. Update requirements.txt to py3.8 compatible

.github/workflows/pytest.yaml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: true  # don't cancel other matrix jobs when one fails
       matrix:
-        python-version: ["3.7", "3.11"]
+        python-version: ["3.8", "3.11"]
         # Test two environments:
         # 1) dependencies with pinned versions from requirements.txt
         # 2) 'pip install --upgrade --upgrade-strategy=eager .' to install upgraded

requirements.txt

@@ -1,16 +1,15 @@
-#colorama==0.4.1
-cycler==0.10.0
-kiwisolver==1.2.0
-matplotlib == 3.2.1
-numpy==1.21.0
-pvlib==0.7.0
+cycler==0.11.0
+kiwisolver==1.4.4
+matplotlib == 3.5.1
+numpy==1.24.2
+pvlib==0.9.4
 pandas==0.25.2
 pvmismatch==4.1
-py==1.10.0
-pyparsing==2.4.7
-pytest==5.4.1
-pytest-cov==2.8.1
-python-dateutil==2.8.0
-pytz==2019.1
-six==1.14.0
+py==1.11.0
+pyparsing==3.0.9
+pytest==7.2.2
+pytest-cov==4.0.0
+python-dateutil==2.9.0
+pytz==2023.3.post1
+six==1.16.0
 tqdm==4.66.3

setup.py

@@ -60,7 +60,6 @@
 
         # Specify the Python versions you support here. In particular, ensure
         # that you indicate whether you support Python 2, Python 3 or both.
-        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',