GitHub: add more domains

data/hosts.yml

@@ -1864,7 +1864,23 @@ hosts:
           - github.com
           - www.github.com
       - ip: 151.101.56.133
-        domain: raw.githubusercontent.com
+        domains:
+          - avatars0.githubusercontent.com
+          - avatars1.githubusercontent.com
+          - avatars2.githubusercontent.com
+          - avatars3.githubusercontent.com
+          - avatars4.githubusercontent.com
+          - avatars5.githubusercontent.com
+          - avatars6.githubusercontent.com
+          - avatars7.githubusercontent.com
+          - avatars8.githubusercontent.com
+          - camo.githubusercontent.com
+          - cloud.githubusercontent.com
+          - gist.githubusercontent.com
+          - marketplace-screenshots.githubusercontent.com
+          - raw.githubusercontent.com
+          - repository-images.githubusercontent.com
+          - user-images.githubusercontent.com
 
   - name: Gmail
     items: