Fix a typo in travis.yml
Fix a typo in travis.yml


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Former-commit-id: 04a31fa3734adc7e05a87cfb1ead7ccb14c1616d
Former-commit-id: e572e7768a4e84b8f8186c1b35a991f4b1030191
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine