#Issue584 Fix docker build

[lifez]

Fixes

#584

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

• Since we install python with --no-install-recommends flag it will not bundle pip. So I add command to install pip in python3.6
• Fix some pip install command

[codecov]

Codecov Report

Merging #596 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #596   +/-   ##
=======================================
  Coverage   86.61%   86.61%           
=======================================
  Files          32       32           
  Lines         979      979           
  Branches      131      131           
=======================================
  Hits          848      848           
  Misses         67       67           
  Partials       64       64

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[thinkingserious]

Thanks @lifez!

[thinkingserious]

Hello @lifez,

Thanks again for the PR!

We appreciate your contribution and look forward to continued collaboration. Thanks!

Team SendGrid DX