update golang.org/x/tools

This brings in the upstream fix
golang/tools@1aadbdf. (Upstream
issue is golang/go#31163).

To create this commit, I did:

  vgo get golang.org/x/tools
  make update_deps
  cd cmd/golangci-lint
  go install -ldflags "-X 'main.version=$(git describe --tags)' -X 'main.commit=$(git rev-parse --short HEAD)' -X 'main.date=$(date)'"

Fixes #500

go.mod

@@ -52,7 +52,7 @@ require (
 	golang.org/x/crypto v0.0.0-20190313024323-a1f597ede03a // indirect
 	golang.org/x/net v0.0.0-20190313220215-9f648a60d977 // indirect
 	golang.org/x/sys v0.0.0-20190312061237-fead79001313 // indirect
-	golang.org/x/tools v0.0.0-20190314010720-f0bfdbff1f9c
+	golang.org/x/tools v0.0.0-20190420000508-685fecacd0a0
 	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

go.sum

@@ -171,8 +171,8 @@ golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20181117154741-2ddaf7f79a09/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20181205014116-22934f0fdb62/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190121143147-24cd39ecf745/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190314010720-f0bfdbff1f9c h1:nE2ID2IbO0sUUG/3vWMz0LStAvkaW9wpnFp/65bxJw8=
-golang.org/x/tools v0.0.0-20190314010720-f0bfdbff1f9c/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190420000508-685fecacd0a0 h1:pa1CyBALPFjblgkNQp7T7gEcFcG/GOG5Ck8IcnSVWGs=
+golang.org/x/tools v0.0.0-20190420000508-685fecacd0a0/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 gopkg.in/airbrake/gobrake.v2 v2.0.9 h1:7z2uVWwn7oVeeugY1DtlPAy5H+KYgB1KeKTnqjNatLo=
 gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=