Fix info/warn print of checks

[kellertuer]

As we noticed in Manifolds.jl/#702 sometimes errors printed on info/warn errored themselves

This was due to a “hardcoded” print using e.val and e.msg which not all errors might have.

This PR fixes that by using showerror instead, which errors should implement anyways.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (65780dc) 99.96% compared to head (5ded609) 99.96%. Report is 1 commits behind head on master.

:exclamation: Current head 5ded609 differs from pull request most recent head 034c08c. Consider uploading reports for the commit 034c08c to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #182 +/- ## ======================================= Coverage 99.96% 99.96% ======================================= Files 27 27 Lines 3093 3107 +14 ======================================= + Hits 3092 3106 +14 Misses 1 1 ```

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