StreamHandler.__repr__: ensure that stream.name is a string

[blueyed]

This fixes a TypeError in case the name is a integer.

Ref: pytest-dev/pytest#2555

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@blueyed, thanks for your PR! By analyzing the history of the files in this pull request, we identified @vsajip, @benjaminp and @nnorwitz to be potential reviewers.

[blueyed]

According to pytest-dev/pytest#2555 (comment) is should be a string, and therefore this fix is not needed here.