fix linting for new src heirarchy

.github/workflows/testing.yml

@@ -30,20 +30,21 @@ jobs:
     - name: Lint with pycodestyle
       run: |
         pip install pycodestyle
-        pycodestyle mkdocs_bibtex
+        pycodestyle src
 
     - name: Lint with mypy
       run: |
         pip install mypy
-        mypy mkdocs_bibtex
+        mypy src
 
     - name: Lint with flake8
       run: |
         pip install flake8
         # stop the build if there are Python syntax errors or undefined names
-        flake8 --count --show-source --statistics mkdocs_bibtex
+        flake8 --count --show-source --statistics src
         # exit-zero treats all errors as warnings.
-        flake8 --count --exit-zero --max-complexity=20 --statistics mkdocs_bibtex
+        flake8 --count --exit-zero --max-complexity=20 --statistics src
+
   test:
     strategy:
       max-parallel: 6