fix: improve error message

[jpoehnelt]

close #2

[codecov-commenter]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master        #3   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           17        17           
  Branches         3         3           
=========================================
  Hits            17        17           

Impacted Files	Coverage Δ
src/index.ts	100.00% <ø> (ø)

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[github-actions]

🎉 This PR is included in version 1.0.1 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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