sds / haml-lint / 621

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main: 97%

Pull #320

travis-ci

Fix warning message in UnnecessaryStringOutput on Ruby 2.7

Ruby 2.7 now displays a warning when you use the `=~` operator on a
non-string Object, showing an error like:

    warning: deprecated Object#=~ is called on RuboCop::AST::SendNode;
    it always returns nil

Fix by performing the comparison only if the string is an actual
`String`.

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