[cross-project-issues-dev] UML2 5.5.0 instead of 5.4.2 for 2018-12

[Kenn Hussey]

The UML2 project will be contributing version 5.5.0 [1] instead of 5.4.2
for 2018-12.

[1] https://projects.eclipse.org/projects/modeling.mdt.uml2/releases/5.5.0