Add permissions to markdownlint workflows (#114)

Author: kendallgassner

.github/workflows/ci.yml

@@ -1,4 +1,7 @@
 name: Run linter and tests
+permissions:
+  contents: read
+  pull-requests: write
 on:
   push:
     branches:

.github/workflows/publish.yml

@@ -1,5 +1,7 @@
 name: Publish
-
+permissions:
+  contents: read
+  pull-requests: write
 on:
   release:
     types: [created]