Merge pull request 'tracer: add Context init to NewOptions' (#323) from tracerctx into v3

Reviewed-on: #323

tracer/options.go

@@ -160,6 +160,7 @@ func NewSpanOptions(opts ...SpanOption) SpanOptions {
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Logger:  logger.DefaultLogger,
+		Context: context.Background(),
 	}
 	for _, o := range opts {
 		o(&options)