Update AppImage.yml

Author: ecmu

.github/workflows/AppImage.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   build:
     #ubuntu bionic:
-    #runs-on: ubuntu-18.04
+    runs-on: ubuntu-18.04
 
     steps:
     # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it