Changes by Version

1.2.0 (2020-07-01)

Restore the ability to reset the current span in context to nil (#231) -- Yuri Shkuro
Use error.object per OpenTracing Semantic Conventions (#179) -- Rahman Syed
Convert nil pointer log field value to string "nil" (#230) -- Cyril Tovena
Add Go module support (#215) -- Zaba505
Make SetTag helper types in ext public (#229) -- Blake Edwards
Add log/fields helpers for keys from specification (#226) -- Dmitry Monakhov
Improve noop impementation (#223) -- chanxuehong
Add an extension to Tracer interface for custom go context creation (#220) -- Krzesimir Nowak
Fix typo in comments (#222) -- meteorlxy
Improve documentation for log.Object() to emphasize the requirement to pass immutable arguments (#219) -- 疯狂的小企鹅
[mock] Return ErrInvalidSpanContext if span context is not MockSpanContext (#216) -- Milad Irannejad

Notable changes:

The library is now released under Apache 2.0 license
Use Set() instead of Add() in HTTPHeadersCarrier is functionally a breaking change (fixes issue #159)
'golang.org/x/net/context' is replaced with 'context' from the standard library

List of all changes:

Export StartSpanFromContextWithTracer (#214)
Add IsGlobalTracerRegistered() to indicate if a tracer has been registered (#201)
Use Set() instead of Add() in HTTPHeadersCarrier (#191)
Update license to Apache 2.0 (#181)
Replace 'golang.org/x/net/context' with 'context' (#176)
Port of Python opentracing/harness/api_check.py to Go (#146)
Fix race condition in MockSpan.Context() (#170)
Add PeerHostIPv4.SetString() (#155)
Add a Noop log field type to log to allow for optional fields (#150)

This release implements OpenTracing Specification 1.0 (https://opentracing.io/spec)