[maven-release-plugin] prepare release codemirror-3.23
[maven-release-plugin] prepare for next development iteration
update to 4.0

Conflicts:
	pom.xml
bump release plugin
[maven-release-plugin] prepare release codemirror-4.0
[maven-release-plugin] prepare for next development iteration
Merge remote-tracking branch 'upstream/master'

Conflicts:
	pom.xml
update CodeMirror to 4.1