release 2.1.1

2.1.1

release version 2.1.0

add modify-value test by @matthewwolfe, fix value bug when value is a…

…n emoty string, increase version to 2.0.3, fixes fiduswriter#40

set license short identifier to 'LGPL-3.0', and tag 2.0.2 version, fixes

 fiduswriter#41

version update to 2.0.1

version update

update version to 1.9.2

update version to 1.9.1

increase version to 1.9.0