Bump github.com/mitchellh/mapstructure from 1.3.2 to 1.3.3

Bumps [github.com/mitchellh/mapstructure](https://github.com/mitchellh/mapstructure) from 1.3.2 to 1.3.3.
- [Release notes](https://github.com/mitchellh/mapstructure/releases)
- [Changelog](https://github.com/mitchellh/mapstructure/blob/master/CHANGELOG.md)
- [Commits](mitchellh/mapstructure@v1.3.2...v1.3.3)

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

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/imdario/mergo v0.3.9
 	github.com/json-iterator/go v1.1.10
 	github.com/kr/pretty v0.1.0 // indirect
-	github.com/mitchellh/mapstructure v1.3.2
+	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