Modifying resources specification to describe capabilities (#196)
Modifying resources specification to describe capabilities (#196)

A focus of the specification on the capabilities that should be
afforded rather than strict requirements around implementation
enable better flexibility to ensure libraries are compatible with
the idioms of their corresponding languages.

This commit incorporates feedback discussed in open-telemetry#191.
open-telemetry/opentelemetry-specification,open-telemetry/opentelemetry-specification