Bump github.com/golangci/golangci-lint from 1.27.0 to 1.28.0 in /tools (#122)

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

Author: dependabot[bot]

tools/go.mod

@@ -4,6 +4,6 @@ go 1.13
 
 require (
 	github.com/client9/misspell v0.3.4
-	github.com/golangci/golangci-lint v1.27.0
-	golang.org/x/tools v0.0.0-20200502202811-ed308ab3e770
+	github.com/golangci/golangci-lint v1.28.0
+	golang.org/x/tools v0.0.0-20200702044944-0cc1aa72b347
 )