Ignore non-zero exit codes on outdated

[Veraticus]

The outdated command on npm versions 4.0.0 and greater exits with exit code 1 if there are any outdated packages (see npm/npm@e768497). This change introduces a non-bang npm_shell_out command (currently used only for outdated) that will not raise on non-zero exit codes to allow for outdated package processing.

[codecov-io]

Current coverage is 99.71% (diff: 93.33%)

Merging #4 into master will decrease coverage by 0.28%

@@           master         #4   diff @@
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  Files          16         16          
  Lines         337        345     +8   
  Methods         0          0          
  Messages        0          0          
  Branches        0          0          
========================================
+ Hits          337        344     +7   
- Misses          0          1     +1   
  Partials        0          0          

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[luiscvalmeida]

Same thing happening to me, for now I forced the 3.10.10 npm version.

[miguelcnf]

Also having this issue so 👍

@coderanger can you have a look?

[saurabhkrjha]

facing the same issue

[rpaddock]

This needs a bump. I'm currently running this patched version due to this issue. Would be great to get it reviewed and into the mainline.

[dee-kryvenko]

@coderanger any chance to get it merged or otherwise fixed any time soon?