Update compilation instructions

[zhogov]

• Have you test the code?
• Have you check that the existing tests are passing?
• The destination branch is develop?

[coveralls]

Coverage decreased (-0.6%) to 74.572% when pulling fa43e8f on zhogov:patch-4 into a72db6d on ssh-vault:master.

[codecov]

Codecov Report

Merging #40 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #40   +/-   ##
=======================================
  Coverage   68.99%   68.99%           
=======================================
  Files          12       12           
  Lines         329      329           
=======================================
  Hits          227      227           
  Misses         62       62           
  Partials       40       40           

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[nbari]

Hi @zhogov #39 maybe is easy to have all changes in one PR

[zhogov]

Don't see a problem with 2 PRs, but this on was opened against master, so ok, I will make one unified PR