dev: fix golang.org/x/tools revision date

Use git log --pretty=fuller to distinguish between
AuthorDate and CommitDate. Use CommitDate for go.mod.

Author: jirfag

go.mod

@@ -56,7 +56,7 @@ require (
 	github.com/valyala/quicktemplate v1.1.1
 	golang.org/x/crypto v0.0.0-20190313024323-a1f597ede03a // indirect
 	golang.org/x/sys v0.0.0-20190312061237-fead79001313 // indirect
-	golang.org/x/tools v0.0.0-20190908161001-5b82db07426d
+	golang.org/x/tools v0.0.0-20190909030654-5b82db07426d
 	gopkg.in/airbrake/gobrake.v2 v2.0.9 // indirect
 	gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2 // indirect
 	gopkg.in/yaml.v2 v2.2.1

vendor/modules.txt

@@ -198,7 +198,7 @@ golang.org/x/sys/windows
 golang.org/x/text/transform
 golang.org/x/text/unicode/norm
 golang.org/x/text/width
-# golang.org/x/tools v0.0.0-20190908161001-5b82db07426d => github.com/golangci/tools v0.0.0-20190910062050-3540c026601b
+# golang.org/x/tools v0.0.0-20190909030654-5b82db07426d => github.com/golangci/tools v0.0.0-20190910062050-3540c026601b
 golang.org/x/tools/go/analysis
 golang.org/x/tools/go/analysis/passes/asmdecl
 golang.org/x/tools/go/analysis/passes/assign