add pm2 on package.json

[codecov-io]

Codecov Report

Merging #57 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #57   +/-   ##
=======================================
  Coverage   99.38%   99.38%           
=======================================
  Files          42       42           
  Lines         326      326           
  Branches       43       43           
=======================================
  Hits          324      324           
  Misses          2        2

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[codeclimate[bot]]

Code Climate has analyzed commit 73453307 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 99.3% (0.0% change).

View more on Code Climate.