Drop support for python 3.5

Author: timvink

.github/workflows/unittests.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix: 
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.5, 3.6, 3.7]
+        python-version: [3.6, 3.7, 3.8, 3.9]
     steps:
     - uses: actions/checkout@master
     - name: Setup Python  

.github/workflows/unittests_codecov.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix: 
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.5, 3.6, 3.7]
+        python-version: [3.6, 3.7, 3.8, 3.9]
     steps:
     - uses: actions/checkout@master
     - name: Setup Python ${{ matrix.python-version }}

setup.py

@@ -14,11 +14,19 @@
     author="Tim Vink",
     author_email="[email protected]",
     license="MIT",
-    python_requires=">=3.5",
+    python_requires=">=3.6",
     classifiers=[
-        "Programming Language :: Python :: 3",
-        "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3 :: Only',
+        "License :: OSI Approved :: MIT License",
+        'Topic :: Documentation',
+        'Topic :: Text Processing',
     ],
     install_requires=["mkdocs>=1.0"],
     packages=find_packages(),