Drop support for Python3.7, not compatible anymore with the latest pint

.gitlab-ci.yml

@@ -66,15 +66,6 @@ unit-tests:
     - python -m pip install -r requirements.txt
     - PYTHONPATH=".:$PYTHONPATH" pytest
 
-unit-tests-37:
-  image: python:3.7
-  stage: test
-  script:
-    - python -m pip install --upgrade pip
-    - python -m pip install pytest pytest-cov pytest-lazy-fixture pytest-mock
-    - python -m pip install -r requirements.txt
-    - PYTHONPATH=".:$PYTHONPATH" pytest
-
 unit-tests-38:
   image: python:3.8
   stage: test

README.rst

@@ -21,7 +21,7 @@ The documentation is available at: https://cfel-sc-public.pages.desy.de/kamzik3/
 Requirements
 ============
 
-  * Python: 3.7 and higher
+  * Python: 3.8 or 3.9
 
   **Python Modules: Backend**
 

setup.py

@@ -15,8 +15,10 @@ setuptools.setup(
     packages=setuptools.find_packages(),
     package_data={"kamzik3": ["*.yml"], "kamzik3.example": ["*.yml", "*.att"]},
     classifiers=[
-        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Operating System :: OS Independent",
+        "Development Status :: 3 - Alpha",
         "Topic :: Software Development :: Libraries :: Python Modules",
         "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
         "Natural Language :: English",
@@ -52,5 +54,5 @@ setuptools.setup(
         "pytest-lazy-fixture": [],
         "pytest-mock": [],
     },
-    python_requires=">=3.7",
+    python_requires=">=3.8, <3.10",
 )