https://git.ruby-lang.org/ruby.git/commit/?id=3d1536e618

From 3d1536e61812dab1f4c226eb60356fd238ab6bb8 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Mon, 1 Jul 2019 00:24:10 +0900
Subject: Build AppVeyor only on master


diff --git a/appveyor.yml b/appveyor.yml
index 06edf95..2aec8dd 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,9 +5,7 @@ platform: https://github.com/ruby/ruby/blob/trunk/appveyor.yml#L5
   - x64
 branches:
   except:
-    # Because default branch is still "trunk", we build only "trunk" to avoid
-    # doubly building on master and trigger CI on Pull Request.
-    - master # mirrored from trunk
+    - trunk # mirrored from trunk. avoid doubly building on it
 environment:
   ruby_version: "24-%Platform%"
   zlib_version: "1.2.11"
-- 
cgit v0.10.2


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