Merge branch 'hotfix/1.21.1' into stable
add fuzzy matching for head rubies, fix #1979
1.21.2
Merge branch 'master' into hotfix/1.21.2
Merge branch 'hotfix/1.21.2'
move to rubygems api to check rubygems version, fix #1977
replace tr with RS in awk, update #1977