Update bundler before installing gems.

Ruby 1.9.3-p551 on Travis CI includes an ancient version of bundler (v1.7.6) that is not compatible with new versions of RubyGems. This causes an 'undefined method `spec' for nil:NilClass' error (see https://travis-ci.org/tzinfo/tzinfo/jobs/272252812). (cherry picked from commit ba1fb98)
tzinfo · Oct 26, 2017 · 8cab278 · 8cab278
1 parent 9b8d1e5
commit 8cab278
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,8 @@
 language: ruby
 dist: trusty
 sudo: false
+before_install:
+  - gem update bundler
 before_script:
   - bundle update
 cache: bundler