chore(package): update eslint to version 4.9.0

[flovilmart]

No description provided.

[codecov]

Codecov Report

Merging #4281 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4281      +/-   ##
==========================================
+ Coverage   92.24%   92.25%   +0.01%     
==========================================
  Files         116      116              
  Lines        8124     8111      -13     
==========================================
- Hits         7494     7483      -11     
+ Misses        630      628       -2

Impacted Files	Coverage Δ
src/RestQuery.js	95.21% <0%> (-0.27%)	⬇️
src/middlewares.js	97.46% <0%> (-0.04%)	⬇️
src/Routers/FunctionsRouter.js	94.59% <0%> (ø)	⬆️
src/triggers.js	94.17% <0%> (ø)	⬆️
src/RestWrite.js	93.71% <0%> (+0.18%)	⬆️
src/ParseServer.js	88.75% <0%> (+0.44%)	⬆️

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