Bump golang.org/x/tools from 0.1.12 to 0.3.0 (#61)

Bumps [golang.org/x/tools](https://github.com/golang/tools) from 0.1.12 to 0.3.0.
- [Release notes](https://github.com/golang/tools/releases)
- [Commits](https://github.com/golang/tools/compare/v0.1.12...v0.3.0)

---
updated-dependencies:
- dependency-name: golang.org/x/tools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -5,6 +5,6 @@ go 1.16
 require (
 	github.com/fatih/structtag v1.2.0
 	go.unistack.org/micro-proto/v3 v3.2.7
-	golang.org/x/tools v0.1.12
+	golang.org/x/tools v0.3.0
 	google.golang.org/protobuf v1.28.1
 )