v1.3.0

New features:

• Support for Jaeger style uber-trace-id headers (#101), thanks @nvx!
• Support for OT headers (#103), thanks @ishg!
• Allow insertion of custom tags on the Zipkin request trace (#102)

Fixes:

• The w3c parsing function was returning a non-used extra value, and it now early-exits (#100), thanks @nvx!
• Creation of baggage items on child spans is now possible (#98), thanks @Asafb26!
• Fixed a bug in which span timestamping could sometimes raise an error (#105), thanks @Asafb26!