travis-ci / dpl / 1394

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travis-ci

Wrap instance_ids in an array

When there is only one OpsWorks instance ID is specified in
`.travis.yml`, even when `instance_ids` is an array, we will receive
only one option on the command line:

    dpl --provider=opsworks --instance-ids=i-deadbeef

This results in a rather counterintuitive error message:

    /home/travis/.rvm/gems/ruby-1.9.3-p551/gems/aws-sdk-v1-1.66.0/lib/aws/core/option_grammar.rb:240:in `validate': expected enumerable value for option instance_ids (AWS::Core::OptionGrammar::FormatError)

We avoid this by wrapping the option in an `Array()` call to ensure
that the option is correct.

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