ci(tox.ini & GitHub Workflows): Need to include multidict for testing otherwise get ImportError, even though not required for normal install.

Author: rbeyer

.github/workflows/code-cover.yml

@@ -26,6 +26,7 @@ jobs:
         python -m pip install --upgrade pip
         python -m pip install pytest
         python -m pip install pytest-cov
+        python -m pip install multidict
     - name: Install pvl
       run: python -m pip install -e .
     - name: Test with pytest and generate coverage report

.github/workflows/python-test.yml

@@ -30,6 +30,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install pytest flake8
+        python -m pip install multidict
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names

tox.ini

@@ -8,6 +8,7 @@ commands =
     pytest
 deps =
     pytest
+    multidict
 
 [testenv:py{36, 37, 38}-allopts]
 deps =