Fix typo in README

[tunetheweb]

Brief summary of the change made

Simple typo fix.

Are there any other side effects of this change that we should be aware of?

Nope!

Pull Request checklist

• Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.
  • .sql/.yml parser test cases in test/fixtures/parser (note YML files can be auto generated with python test/generate_parse_fixture_yml.py or by running tox locally).
  • Full autofix test cases in test/fixtures/linter/autofix.
  • Other.

• Added appropriate documentation for the change.

• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[codecov]

Codecov Report

Merging #1320 (ffd80cc) into main (7a981b5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1320   +/-   ##
=======================================
  Coverage   96.13%   96.13%           
=======================================
  Files         124      124           
  Lines        8609     8609           
=======================================
  Hits         8276     8276           
  Misses        333      333           

Flag	Coverage Δ
dbt018-py38	60.68% <ø> (ø)
dbt019-py38	60.68% <ø> (ø)
dbt020-py38	60.64% <ø> (ø)
py36	94.86% <ø> (ø)
py37	94.89% <ø> (ø)
py38	94.88% <ø> (ø)
py39	94.88% <ø> (ø)

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