Support opentelemetry and api libraries version 0.5.0

[CrowdHailer]

Currently overriding in my mix dependencies.

investigating a bit more it looks like the location of some .hrl files has moved.

When trying to compile opentelemetry_zipkin. I get

src/opentelemetry_zipkin.erl:9: can't find include lib "opentelemetry/include/ot_span.hrl"; Make sure opentelemetry is in your app file's 'applications' list
src/opentelemetry_zipkin.erl:125: undefined macro 'SPAN_KIND_UNSPECIFIED'

src/opentelemetry_zipkin.erl:61: record span undefined
src/opentelemetry_zipkin.erl:62: record span undefined
src/opentelemetry_zipkin.erl:63: record span undefined
src/opentelemetry_zipkin.erl:64: record span undefined
src/opentelemetry_zipkin.erl:65: record span undefined
src/opentelemetry_zipkin.erl:65: record span undefined
src/opentelemetry_zipkin.erl:68: function to_kind/1 undefined
src/opentelemetry_zipkin.erl:68: record span undefined
src/opentelemetry_zipkin.erl:69: record span undefined
src/opentelemetry_zipkin.erl:70: record span undefined
src/opentelemetry_zipkin.erl:71: record span undefined