Add multi vars example to README

[devuxer]

Addresses documentation request in #62

What: Add example showing how to set more than one env var at a time

Why: Gap in documentation

How: Editing the README

Checklist:

• [x] Documentation
• [ ] Tests - N/A
• [x] Ready to be merged

[codecov[bot]]

Codecov Report

Merging #240 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #240   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines           78        78           
  Branches        18        18           
=========================================
  Hits            78        78           

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[kentcdodds]

@all-contributors please add @devuxer for docs

[allcontributors[bot]]

@kentcdodds

I've put up a pull request to add @devuxer! :tada:

[devuxer]

@kentcdodds , My pleasure, and fun to see all the automation/bots you have going on here!

[github-actions[bot]]

:tada: This PR is included in version 7.0.3 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket: