Build failure

[nageshlop]

The build on amd64 and ppc64le architecture is failing with below error message.

$ gem install bundler --no-document
YAML safe loading is not available. Please upgrade psych to a version that supports safe loading (>= 2.0).
Fetching: bundler-2.2.2.gem (100%)
ERROR: Error installing bundler:
The last version of bundler (>= 0) to support your Ruby & RubyGems was 1.17.3. Try installing it with gem install bundler -v 1.17.3
bundler requires Ruby version >= 2.3.0. The current ruby version is 2.0.0.
The command "gem install bundler --no-document" failed and exited with 1 during .
Your build has been stopped.

The job config and build logs can be found at below location.
https://travis-ci.com/github/nageshlop/yajl-ruby/jobs/462294507