From cb0bb780d839ed646d1c7e8089f836b9e994fcbf Mon Sep 17 00:00:00 2001
From: Mengxuan Xia <xiamx2004@gmail.com>
Date: Mon, 10 Jul 2017 12:11:10 -0400
Subject: [PATCH] add opt_release 20 to travis build

---
 .travis.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index 137dc49..0992bf5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,9 @@ addons:
 language: elixir
 elixir:
   - 1.4.5
+otp_release:
+  - 18.2.1
+  - 20.0
 
 install:
   - export CC="clang"