Add exponential bucketing to histogram protobuf (#149)
Add exponential bucketing to histogram protobuf (#149)

* add text/0000-exponential-histogram.md

* rename to match PR#

* fix lint complaint

* more lint fix

* remove statement on inclusive vs. exclusive bounds

Co-authored-by: Joshua MacDonald <f3bd74e7fbbcca8170a843c74945d604f45dfc0a@users.noreply.github.com>
open-telemetry/oteps