Add ruby-head as a allow failures in .travis.yml.

[junaruga]

Summary

I added "ruby-head" as a "allow_failures".

Details

Motivation and Context

See cucumber/cucumber-ruby#1087 for detail and the motivation.

How Has This Been Tested?

Travis tests my modified code.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I've added tests for my code
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[mattwynne]

Good idea!

[lock]

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