Fix Bundler related error on Travis CI

methodmissing / rbczmq

Ruby extension that wraps the official high level ZeroMQ C API ( http://czmq.zeromq.org/ )

http://github.com/methodmissing/rbczmq

MIT License

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Open kou opened 8 years ago

kou commented 8 years ago

The following error is caused by old Bundler.

$ bundle install --quiet
NoMethodError: undefined method `spec' for nil:NilClass