updating version to 2.2.3

updating version to 2.2.2

updating version to 2.2.1

Refactor help message for --O1 option in input_user.rs to clarify --O…

…1 is the default option

updating version to 2.1.9

updating version to 2.1.8

updating version to 2.1.7

Update RELEASES.md

version 2.1.5

version 2.1.4