docs: fixes typo on the fireEvent example

[aputhin]

What:

Fixed a typo on the fireEvent so the examples on the README follow the same coding style.

Why:

Keep the docs consistent.

How:

• added 'from react-testing-library' on the import for the said example
• removed a semicolon after const spy = jest.fn() :)

Checklist:

• Documentation
• Tests
• Ready to be merged
• Added myself to contributors table

[codecov]

Codecov Report

Merging #49 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #49   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          18     18           
=====================================
  Hits           18     18

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[kentcdodds]

Ah! I didn't actually see this typo! Normally the javascript in our markdown is autoformatted by prettier, but there's a syntax error in this code block which is why that semicolon is hanging around. Can you find and fix the syntax error too?

[aputhin]

I think we found it xD thanks to @thiagopaiva99 who helped me find it (should add him to contributors aswell I guess?)

[kentcdodds]

That's better! Thanks :D