Update README.md

[MichaelJCole]

mongodb-runner has a node 14 problem, which breaks the introduction for new user.

[codecov]

Codecov Report

Merging #7018 (8e7b51d) into master (c958c46) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7018      +/-   ##
==========================================
- Coverage   93.85%   93.81%   -0.05%     
==========================================
  Files         169      169              
  Lines       12415    12415              
==========================================
- Hits        11652    11647       -5     
- Misses        763      768       +5     

Impacted Files	Coverage Δ
src/Adapters/Files/GridFSBucketAdapter.js	79.50% <0.00%> (-0.82%)	⬇️
src/Adapters/Storage/Mongo/MongoStorageAdapter.js	92.92% <0.00%> (-0.67%)	⬇️
src/RestWrite.js	93.67% <0.00%> (-0.17%)	⬇️

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[dplewis]

Looks like this issue has been addressed mongodb-js/runner#174

Waiting for a release. (Hasn't been a release in 10 months)

[MichaelJCole]

This is a patch for the README.md to include information for visitors evaluating Parse.

It does not relate to code coverage. @codecov you are a wrong robot.

While the referenced patch might fix this startup issue, it seems prudent to still include the warning in case of other compatibility issues w/ node 14+.

[dplewis]

Thanks for the PR. This issue has been addressed in #7029.