add 5.10-backcompat to release notes
add 5.10-backcompat to release notes

GMOD/jbrowse,nathandunn/jbrowse,Arabidopsis-Information-Portal/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,Arabidopsis-Information-Portal/jbrowse,erasche/jbrowse,erasche/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,erasche/jbrowse,limeng12/jbrowse,limeng12/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,erasche/jbrowse,erasche/jbrowse,GMOD/jbrowse,Arabidopsis-Information-Portal/jbrowse,GMOD/jbrowse,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,nathandunn/jbrowse,erasche/jbrowse,erasche/jbrowse,limeng12/jbrowse,limeng12/jbrowse,GMOD/jbrowse,GMOD/jbrowse,limeng12/jbrowse