[wp-trac] [WordPress Trac] #40539: Add composer packages and composer cache to Travis CI cache

[WordPress Trac]

#40539: Add composer packages and composer cache to Travis CI cache
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 Reporter:  netweb            |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  4.8
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 Following up from [40269] we should add composer packages and composer
 cache to the Travis CI cache.

 https://docs.travis-ci.com/user/caching/

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Ticket URL: <https://core.trac.wordpress.org/ticket/40539>
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