Bump gopkg.in/yaml.v2 from 2.2.2 to 2.3.0

Bumps [gopkg.in/yaml.v2](https://github.com/go-yaml/yaml) from 2.2.2 to 2.3.0.
- [Release notes](https://github.com/go-yaml/yaml/releases)
- [Commits](go-yaml/yaml@v2.2.2...v2.3.0)

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

go.mod

@@ -13,5 +13,5 @@ require (
 	github.com/mitchellh/mapstructure v1.3.3
 	github.com/stretchr/testify v1.3.0
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
-	gopkg.in/yaml.v2 v2.2.2
+	gopkg.in/yaml.v2 v2.3.0
 )