Fix typo of TraceProvider in changelog
@@ -147,7 +147,7 @@ Released 2020-03-16
([#431](https://github.com/open-telemetry/opentelemetry-python/pull/431))
- Renaming TraceOptions to TraceFlags
([#450](https://github.com/open-telemetry/opentelemetry-python/pull/450))
-- Renaming TracerSource to TraceProvider
+- Renaming TracerSource to TracerProvider
([#441](https://github.com/open-telemetry/opentelemetry-python/pull/441))
- Adding attach/detach methods as per spec
([#429](https://github.com/open-telemetry/opentelemetry-python/pull/450)
