From 8788c3a75e2773d074a9159c284a24a9d64e29c8 Mon Sep 17 00:00:00 2001
From: Holger Just <hello@holgerjust.de>
Date: Fri, 11 Jan 2019 11:21:04 +0100
Subject: [PATCH] Explicitly install Bundler < 2.0 for older Ruby versions on
 Travis CI

---
 .travis.yml | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 7ff974f..cf2392a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -43,7 +43,15 @@ matrix:
     - rvm: jruby-head
 
 before_install:
-  - "gem install bundler"
+  # Bundler 2.0 requires at least Ruby 2.3. We need to explicitly install an
+  # older version of bundler for older Ruby versions since they can't / won't
+  # check their required versions on their own.
+  - |
+    if [[ "$(rvm current)" =~ ^(ruby-2\.[012]|jruby-9\.0) ]]; then
+      gem install bundler -v '< 2.0'
+    else
+      gem install bundler
+    fi
 
 script:
   - bundle exec rspec