https://git.ruby-lang.org/ruby.git/commit/?id=be851692ce

From be851692cec43470aceed23ff40c198deb4d4680 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Sat, 25 May 2019 07:21:45 -0700
Subject: Build trunk branch too to trigger Travis on PR


diff --git a/.travis.yml b/.travis.yml
index eebd5cb..2d6ea86 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -439,6 +439,7 @@ script: https://github.com/ruby/ruby/blob/trunk/.travis.yml#L439
 branches:
   only:
     - master
+    - trunk # for pull request. TODO: use `fork = true` or something.
     - ruby_2_4
     - ruby_2_5
     - ruby_2_6
-- 
cgit v0.10.2


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