Drop old python versions in test definition file

Author: reilleya

.github/workflows/tests.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8]
+        python-version: ['3.8', '3.9', '3.10']
 
     steps:
     - uses: actions/checkout@v2

README.md

@@ -30,7 +30,7 @@ The easiest way to use openMotor is to navigate to the 'releases' sidebar, click
 
 Building from Source
 --------------------
-The program is currently being developed using python 3.8. The dependencies are outlined in `requirements.txt`, the main ones include `PyQt5`, `matplot`, `numpy`, `scipy`, `scikit-fmm`, and `scikit-image`. Because the PyQt5 bindings are used for the GUI, Qt5 must also be installed.
+The program is currently being developed using python 3.10. The dependencies are outlined in `requirements.txt`, the main ones include `PyQt5`, `matplot`, `numpy`, `scipy`, `scikit-fmm`, and `scikit-image`. Because the PyQt5 bindings are used for the GUI, Qt5 must also be installed.
 
 The easiest way to build/run from source code is to clone the repository and install the required dependencies into a virtual enviornment:
 ```