Updating README.md to reflect ORIGIN_OR_FROM_NUMBER

[erstazi]

Updating README.md to reflect ORIGIN_OR_FROM_NUMBER where wanted or required in some countries.

[codecov-commenter]

Codecov Report

Merging #12 (851073d) into master (c3eac17) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master       #12   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        47        47           
===========================================
  Files              6         6           
  Lines            160       160           
===========================================
  Hits             160       160           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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