Update Binary format in the Specification

[carlosalberto]

As #426 is temporarily removing Binary format, we need to make sure Binary is re-added and updated properly with the OTEP 66 updates.

Assigning for now to @MikeGoldsmith but we can discuss who can tackle this item going forward.

[bogdandrutu]

Added @carlosalberto to the assignees since he promised to add it back :)

[carlosalberto]

That works :)

[Oberon00]

Can we assign a milestone for this issue? Any release that wants to offer a full OpenTracing or OpenCensus compatibility layer will need this feature.

[Oberon00]

Also, we need that feature at Dynatrace and will have to stay on an older version of the Java API until this is fixed.

[carlosalberto]

@Oberon00 So the milestone would be 0.5.0 - for which we don't have a date for yet (other than being the next important milestone). Maybe we need to discuss this in the next SIG/community call, to plan what/how happens after beta ;)