fix typo in exp!(::TensorMap) errormessage

[VictorVanthilt]

Exponentional -> Exponential

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.72%. Comparing base (419f88c) to head (387d76a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #154   +/-   ##
=======================================
  Coverage   79.72%   79.72%           
=======================================
  Files          42       42           
  Lines        4961     4961           
=======================================
  Hits         3955     3955           
  Misses       1006     1006           

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[VictorVanthilt]

Running all these tests just for updating an errorstring seems a bit excessive ...

[lkdvos]

https://github.blog/changelog/2021-02-08-github-actions-skip-pull-request-and-push-workflows-with-skip-ci/

[VictorVanthilt]

I will use this in the future instead of wasting tons of compute on a typochange, thanks!