Add architecture ppc64le to travis build

[zazzel]

Hi,
I had added ppc64le support on Travis-ci and Its been success added and build. Kindly review and merge same.

Changes done are added ppc64le arch.

The Travis ci build logs can be verified from the link below.
https://travis-ci.com/github/zazzel/js-deep-for-each
Please have a look.

Thank you

[codecov]

Codecov Report

Merging #44 (fc7e907) into master (5f929ff) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #44   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           13        13           
  Branches         4         4           
=========================================
  Hits            13        13           

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[acostalima]

If the pipeline runs to completion faster on ppc64le than amd64 today as claimed, I don't really mind merging this. We can even drop amd64 for the time being, I guess. However, even though ppc64le is supposed to benefit from faster boot times, the last run of the pipeline took longer than amd64.

@satazor, thoughts? We're in the process of moving the CI to GitHub Actions anyhow.

Background:

• https://blog.travis-ci.com/2019-11-12-multi-cpu-architecture-ibm-power-ibm-z
• https://docs.travis-ci.com/user/multi-cpu-architectures/#testing-on-multiple-cpu-architectures