Dependency version specifiers

[dbrgn]

Maven publication 'SaltyRTC' contains dependencies that will produce a pom file that cannot be consumed by a Maven client.
  - org.saltyrtc.chunked-dc:chunked-dc:1.+ declared with a Maven incompatible version notation
  - org.msgpack:msgpack-core:0.8.+ declared with a Maven incompatible version notation
  - com.fasterxml.jackson.core:jackson-databind:2.10.+ declared with a Maven incompatible version notation
  - com.neovisionaries:nv-websocket-client:2.9+ declared with a Maven incompatible version notation
  - org.msgpack:jackson-dataformat-msgpack:0.8.+ declared with a Maven incompatible version notation

Not sure if we should care. I think as long as nobody complains, we keep them.