alphagov / accessible-autocomplete / 539

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travis-ci

Update prepush script to only look at file names

The prepush script will fail because `git diff dist/` returns a really
long output which causes Node to throw `stdout maxBuffer exceeded`.

`git diff --name-only` outputs only the changed filenames which is
much shorter.

Also display the actual stack trace in the event of an unexpected
error.

183 of 230 branches covered (79.57%)

214 of 223 relevant lines covered (95.96%)

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