Bump org.eclipse.jdt.annotation from 2.0.0 to 2.1.0 (#32)
Bump org.eclipse.jdt.annotation from 2.0.0 to 2.1.0 (#32)

see https://bugs.eclipse.org/bugs/show_bug.cgi?id=489900

This lets us use the org.eclipse.jdt.annotation.Checks utility,
announced on https://www.eclipse.org/eclipse/news/4.6/M6.
lastnpe/eclipse-null-eea-augments,lastnpe/eclipse-null-eea-augments