update golang.org/x/tools in go.mod

Author: jirfag

go.mod

@@ -56,7 +56,7 @@ require (
 	github.com/spf13/viper v1.0.2
 	github.com/stretchr/testify v1.2.1
 	golang.org/x/crypto v0.0.0-20180505025534-4ec37c66abab // indirect
-	golang.org/x/tools v0.0.0-20180831211245-7ca132754999
+	golang.org/x/tools v0.0.0-20180831211245-5d4988d199e2
 	gopkg.in/airbrake/gobrake.v2 v2.0.9 // indirect
 	gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2 // indirect
 	sourcegraph.com/sourcegraph/go-diff v0.0.0-20171119081133-3f415a150aec

go.sum

@@ -131,6 +131,7 @@ golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180826000951-f6ba57429505/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20180831211245-5d4988d199e2/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180831211245-7ca132754999 h1:mf2VYfMpSMTlp0I/UXrX13w5LejDx34QeUUHH4TrUA8=
 golang.org/x/tools v0.0.0-20180831211245-7ca132754999/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 gopkg.in/airbrake/gobrake.v2 v2.0.9 h1:7z2uVWwn7oVeeugY1DtlPAy5H+KYgB1KeKTnqjNatLo=