Update module contrib.go.opencensus.io/exporter/zipkin to v0.1.2

This MR contains the following updates:

Package	Type	Update	Change
contrib.go.opencensus.io/exporter/zipkin	require	patch	v0.1.1 -> v0.1.2

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Release Notes

census-ecosystem/opencensus-go-exporter-zipkin

v0.1.2

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go.mod

@@ -3,7 +3,7 @@ module git.autistici.org/ai3/go-common
 go 1.11
 
 require (
-	contrib.go.opencensus.io/exporter/zipkin v0.1.1
+	contrib.go.opencensus.io/exporter/zipkin v0.1.2
 	github.com/amoghe/go-crypt v0.0.0-20191109212615-b2ff80594b7f
 	github.com/bbrks/wrap/v2 v2.5.0
 	github.com/cenkalti/backoff v2.2.1+incompatible