[release] new version commit:  'v0.0.20'.
[release] new version commit:  'v0.0.20'.

itemis/xtext-languageserver-example,cdietrich/xtext-languageserver-example,itemis/xtext-languageserver-example,cdietrich/xtext-languageserver-example,itemis/xtext-languageserver-example,itemis/xtext-languageserver-example,cdietrich/xtext-languageserver-example,cdietrich/xtext-languageserver-example