build(deps): bump github.com/rs/zerolog from 1.14.3 to 1.15.0 (#182)

Bumps [github.com/rs/zerolog](https://github.com/rs/zerolog) from 1.14.3 to 1.15.0.
- [Release notes](https://github.com/rs/zerolog/releases)
- [Commits](rs/zerolog@v1.14.3...v1.15.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

go.mod

@@ -24,7 +24,7 @@ require (
 	github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
 	github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829 // indirect
 	github.com/rs/cors v1.7.0
-	github.com/rs/zerolog v1.14.3
+	github.com/rs/zerolog v1.15.0
 	go.opencensus.io v0.22.0
 	golang.org/x/crypto v0.0.0-20190411191339-88737f569e3a
 	golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421

go.sum

@@ -150,6 +150,8 @@ github.com/rs/cors v1.7.0/go.mod h1:gFx+x8UowdsKA9AchylcLynDq+nNFfI8FkUZdN/jGCU=
 github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
 github.com/rs/zerolog v1.14.3 h1:4EGfSkR2hJDB0s3oFfrlPqjU1e4WLncergLil3nEKW0=
 github.com/rs/zerolog v1.14.3/go.mod h1:3WXPzbXEEliJ+a6UFE4vhIxV8qR1EML6ngzP9ug4eYg=
+github.com/rs/zerolog v1.15.0 h1:uPRuwkWF4J6fGsJ2R0Gn2jB1EQiav9k3S6CSdygQJXY=
+github.com/rs/zerolog v1.15.0/go.mod h1:xYTKnLHcpfU2225ny5qZjxnj9NvkumZYjJHlAThCjNc=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/goconvey v0.0.0-20180222194500-ef6db91d284a/go.mod h1:XDJAKZRPZ1CvBcN2aX5YOUTYGHki24fSF0Iv48Ibg0s=