Add a whitelist to avoid publishing unwanted files in the registry

[fraxken]

Add the "files" field in the package.json to avoid publishing unwanted files in the registry. Files like

• gitignore
• travis.yml
• equation.gif
• Makefile (which seem to be used to release the package instead of npm scripts)

More information on the whitelist field here: https://docs.npmjs.com/files/package.json#files

[codecov[bot]]

Codecov Report

Merging #72 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #72   +/-   ##
======================================
  Coverage    90.2%   90.2%           
======================================
  Files           2       2           
  Lines         143     143           
======================================
  Hits          129     129           
  Misses         14      14

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[tim-kos]

Thank you!

[wizo06]

@tim-kos This needs to be fixed. index.js is not included in "files": [...] and therefore will not be included in the npm registry when you publish the next version.

This is what happens when index.js is missing

Error: Cannot find module '.../node_modules/retry/index'. Please verify that the package.json has a valid "main" entry

[wizo06]

Another solution is to correct the typo from "main": "index" to "main": "index.js".