Add missing export statement

[qiuhaohao]

Add missing export statement in puppeteer_environment.js

Just found that the puppeteer_environment.js under docs/Puppeteer.md doesn't export the environment

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[mattphillips]

Thanks @qiuhaohao would you mind adding a changelog entry? Also you need to add a semicolon to the end of the export line to fix the lint error

module.exports = PuppeteerEnvironment;

[codecov-io]

Codecov Report

Merging #7127 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #7127   +/-   ##
======================================
  Coverage    66.6%   66.6%           
======================================
  Files         253     253           
  Lines       10629   10629           
  Branches        4       3    -1     
======================================
  Hits         7079    7079           
  Misses       3549    3549           
  Partials        1       1

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[qiuhaohao]

Hi @mattphillips Thanks for the reminder. Should have read the contribution guideline better. It should be fine now: )

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