v1.3.0

Support of sprotty ^1.0, not only 1.0

Sprotty v1.0 support & improvements of the router

Merge pull request #2 from Aksem/feature/improve-anchors

v1.2.1: rework anchors logic, move router options and edge in …

v1.0.35

V1.0.35: improve performance and fix bugs with labels and anchors.