Add LogCosh Error

[stancld]

What does this PR do?

Fixes #1315

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Merging #1316 (13d7e62) into master (a3dc40c) will decrease coverage by 50%.
The diff coverage is 98%.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1316     +/-   ##
========================================
- Coverage      87%     37%    -50%     
========================================
  Files         193     195      +2     
  Lines       11297   11346     +49     
========================================
- Hits         9790    4198   -5592     
- Misses       1507    7148   +5641     

[SkafteNicki]

LGTM :]
Really great work :)