Bump github.com/newrelic/go-agent (#441)

Bumps [github.com/newrelic/go-agent](https://github.com/newrelic/go-agent) from 3.8.0+incompatible to 3.8.1+incompatible.
- [Release notes](https://github.com/newrelic/go-agent/releases)
- [Changelog](https://github.com/newrelic/go-agent/blob/master/CHANGELOG.md)
- [Commits](https://github.com/newrelic/go-agent/compare/v3.8.0...v3.8.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/honeybadger-io/honeybadger-go v0.5.0
 	github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0 // indirect
 	github.com/matoous/go-nanoid v1.4.1
-	github.com/newrelic/go-agent v3.8.0+incompatible
+	github.com/newrelic/go-agent v3.8.1+incompatible
 	github.com/prometheus/client_golang v1.7.1
 	github.com/sirupsen/logrus v1.6.0
 	github.com/stretchr/testify v1.6.1

go.sum

@@ -279,6 +279,8 @@ github.com/nats-io/nkeys v0.0.2/go.mod h1:dab7URMsZm6Z/jp9Z5UGa87Uutgc2mVpXLC4B7
 github.com/nats-io/nuid v1.0.1/go.mod h1:19wcPz3Ph3q0Jbyiqsd0kePYG7A95tJPxeL+1OSON2c=
 github.com/newrelic/go-agent v3.8.0+incompatible h1:IxJKEK7SihVTXTDIpjl2GW2x3kl47yyi7IEq/jpbgME=
 github.com/newrelic/go-agent v3.8.0+incompatible/go.mod h1:a8Fv1b/fYhFSReoTU6HDkTYIMZeSVNffmoS726Y0LzQ=
+github.com/newrelic/go-agent v3.8.1+incompatible h1:8TAEekJseggmwfn79CjoV308PyNlzDVExkUwFeDBUxk=
+github.com/newrelic/go-agent v3.8.1+incompatible/go.mod h1:a8Fv1b/fYhFSReoTU6HDkTYIMZeSVNffmoS726Y0LzQ=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.10.3/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=