add omd.1.2.0
fix: remove constraint on version of omd

modified: stone.0.3.2/opam
fix: remove constraint on version of omd

modified:   cowabloga.0.0.7/opam
update md5sum

modified:   url
add omd.1.2.1
Merge pull request #3004 from pw374/master

add omd.1.2.1