build(deps): bump gopkg.in/DataDog/dd-trace-go.v1 from 1.18.0 to 1.19.0 (#3418)

Bumps [gopkg.in/DataDog/dd-trace-go.v1](https://github.com/DataDog/dd-trace-go) from 1.18.0 to 1.19.0.
- [Release notes](https://github.com/DataDog/dd-trace-go/releases)
- [Commits](https://github.com/DataDog/dd-trace-go/compare/v1.18.0...v1.19.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

go.mod

@@ -46,7 +46,7 @@ require (
 	google.golang.org/api v0.13.0
 	google.golang.org/genproto v0.0.0-20190701230453-710ae3a149df // indirect
 	google.golang.org/grpc v1.24.0
-	gopkg.in/DataDog/dd-trace-go.v1 v1.18.0
+	gopkg.in/DataDog/dd-trace-go.v1 v1.19.0
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	k8s.io/api v0.0.0-20190620084959-7cf5895f2711
 	k8s.io/apimachinery v0.0.0-20190612205821-1799e75a0719

go.sum

@@ -477,6 +477,8 @@ google.golang.org/grpc v1.24.0 h1:vb/1TCsVn3DcJlQ0Gs1yB1pKI6Do2/QNwxdKqmc/b0s=
 google.golang.org/grpc v1.24.0/go.mod h1:XDChyiUovWa60DnaeDeZmSW86xtLtjtZbwvSiRnRtcA=
 gopkg.in/DataDog/dd-trace-go.v1 v1.18.0 h1:n0pmVs3TxCRC9Jrd1/aNaB8roW5ZHMw0UOWPxAoUkkI=
 gopkg.in/DataDog/dd-trace-go.v1 v1.18.0/go.mod h1:DVp8HmDh8PuTu2Z0fVVlBsyWaC++fzwVCaGWylTe3tg=
+gopkg.in/DataDog/dd-trace-go.v1 v1.19.0 h1:aFSFd6oDMdvPYiToGqTv7/ERA6QrPhGaXSuueRCaM88=
+gopkg.in/DataDog/dd-trace-go.v1 v1.19.0/go.mod h1:DVp8HmDh8PuTu2Z0fVVlBsyWaC++fzwVCaGWylTe3tg=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=