Force pull requests to fetch history (#5)

* Force pull requests to fetch history. Previous 
   implementation only fetched the latest 
   changes made in the current branch. Since 
   the CI pipeline only triggers on the latest 
   pushed commit, this means linting errors can 
   be avoided e.g due to multiple commits in a 
   push.

.github/workflows/test.yml

@@ -21,6 +21,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+      with:
+        fetch-depth: 100 # assumes PR/push to master is no larger than 100 commits. Other solutions are needlessly complex.
 
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v3