travis: Remove error-type examples's cache #551
Merged
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Exercise's examples that are always expected to fail the building step are rebuilt by Stack everytime. This triggers a cache update in Travis-CI, even when nothing changed in the repository.
While this problem doesn't affect pull requests that already change the cache, it slows down the all the other PRs by sometimes around 3 minutes.
Removing the cache folder for error-type examples, we expect to have clean rebuilds in Travis.
Closes #544.