Attempt to fix the markdown link checker. (#387)

Make sure it runs for pull requests as well as pushes to master.
Otherwise, I think, it may not trigger to satisfy the requirement.

* Fold in version bump from #385.

Co-authored-by: sweexordious <chamirachid1@gmail.com>

.github/workflows/action.yml

@@ -1,6 +1,11 @@
 name: Check Markdown links
 
-on: push
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches: [master]
 
 jobs:
   markdown-link-check:
@@ -8,3 +13,5 @@ jobs:
     steps:
     - uses: actions/checkout@master
     - uses: gaurav-nelson/github-action-markdown-link-check@1.0.13
+      with:
+        check-modified-files-only: 'yes'

.github/workflows/linter.yml

@@ -13,8 +13,11 @@ jobs:
     steps:
       - name: Checkout Code
         uses: actions/checkout@v2
+        with:
+          # Full git history is needed to get a proper list of changed files within `super-linter`
+          fetch-depth: 0
       - name: Lint Code Base
-        uses: docker://github/super-linter:v3
+        uses: docker://github/super-linter:v4
         env:
           LINTER_RULES_PATH: .
           VALIDATE_ALL_CODEBASE: false