update dependencies

Ran a `go get -u` and bumped K8s deps to 1.15.0.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/uber/jaeger-client-go/config/options.go

@@ -33,6 +33,7 @@ type Options struct {
 	contribObservers    []jaeger.ContribObserver
 	observers           []jaeger.Observer
 	gen128Bit           bool
+	poolSpans           bool
 	zipkinSharedRPCSpan bool
 	maxTagValueLength   int
 	tags                []opentracing.Tag
@@ -93,6 +94,13 @@ func Gen128Bit(gen128Bit bool) Option {
 	}
 }
 
+// PoolSpans specifies whether to pool spans
+func PoolSpans(poolSpans bool) Option {
+	return func(c *Options) {
+		c.poolSpans = poolSpans
+	}
+}
+
 // ZipkinSharedRPCSpan creates an option that enables sharing span ID between client
 // and server spans a la zipkin. If false, client and server spans will be assigned
 // different IDs.