fix: allow optional description for relay mutation plugin

[bastiankistner]

No description provided.

[codecov]

Codecov Report

Merging #10 (88c5e71) into master (6b29ef9) will not change coverage.
The diff coverage is n/a.

❗ Current head 88c5e71 differs from pull request most recent head 3a61bcf. Consider uploading reports for the commit 3a61bcf to get more accurate results

@@           Coverage Diff           @@
##           master      #10   +/-   ##
=======================================
  Coverage   94.52%   94.52%           
=======================================
  Files           6        6           
  Lines         201      201           
  Branches       76       76           
=======================================
  Hits          190      190           
  Misses         10       10           
  Partials        1        1           

Flag	Coverage Δ
relaymutation	100.00% <ø> (ø)

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

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