Update readme for changes made since notes for v1.5.0 were originally…

… made (microsoft#1846)

Release Notes for v1.4 (microsoft#1676)

Port Release Testing to 1.1 (microsoft#1597)

Release Notes for upcoming prerelease/1.3 (microsoft#1523)

Bump cobalt patch version (microsoft#1522)

OpenSSL Resumption / 0-RTT Work (microsoft#1376)

Fix VER_FILEVERSION Patch Version

Cherry-Pick: New Session Ticket Encryption Key API (microsoft#1213) (m…

…icrosoft#1285)

Fix Version

Weekly Release Build (microsoft#1123) (microsoft#1125)