update ci

.github/workflows/ci.yml

@@ -3,11 +3,11 @@ name: Continuous Integration
 on:
   push:
     branches:
-    - master
+    - main
 
   pull_request:
     branches:
-    - master
+    - main
 
 jobs:
   lint:
@@ -140,7 +140,7 @@ jobs:
     # this comment and the last line in the conditional below.
     # If you do not wish to use GitHub Pages for deploying documentation, then
     # simply delete this job similarly to the coverage one.
-    if: github.ref == 'refs/heads/master'
+    if: github.ref == 'refs/heads/main'
       && github.event_name == 'push'
       && github.repository_owner == '<name>'
       && false
@@ -151,9 +151,6 @@ jobs:
     - uses: actions/setup-python@v2
       with: { python-version: "3.8" }
 
-    - name: Install m.css dependencies
-      run: pip3 install jinja2 Pygments
-
     - name: Install Doxygen
       run: sudo apt-get update -q
         && sudo apt-get install doxygen -q -y