Update CI.yml

Author: jonathanBieler

.github/workflows/CI.yml

@@ -2,7 +2,7 @@ name: CI
 on:
   push:
     branches:
-      - main
+      - master
     tags: ['*']
   pull_request:
 concurrency:
@@ -58,4 +58,4 @@ jobs:
             using Documenter: DocMeta, doctest
             using GtkMarkdownTextView
             DocMeta.setdocmeta!(GtkMarkdownTextView, :DocTestSetup, :(using GtkMarkdownTextView); recursive=true)
-            doctest(GtkMarkdownTextView)'
+            doctest(GtkMarkdownTextView)'