converted README to reStructuredText and version as plain text file#663

Merged

thinkingserious merged 4 commits intosendgrid:v4from

StrikerRUS:pypi_v4

Oct 23, 2018

Commits on Oct 9, 2018

Commits on Oct 11, 2018

Merge remote-tracking branch 'upstream/v4' into pypi_v4
StrikerRUS
committed