Upgrade golangci-lint

- Fix a SQL string concatenation
- Install golangci-lint using `tools.go`

go.mod

@@ -18,6 +18,7 @@ require (
 	github.com/go-chi/cors v1.1.1
 	github.com/go-chi/httprate v0.4.0
 	github.com/go-chi/jwtauth v4.0.4+incompatible
+	github.com/golangci/golangci-lint v1.31.0
 	github.com/google/uuid v1.1.2
 	github.com/google/wire v0.4.0
 	github.com/kennygrant/sanitize v0.0.0-20170120101633-6a0bfdde8629
@@ -28,22 +29,19 @@ require (
 	github.com/onsi/ginkgo v1.14.1
 	github.com/onsi/gomega v1.10.2
 	github.com/pelletier/go-toml v1.8.0 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pressly/goose v2.6.0+incompatible
 	github.com/sirupsen/logrus v1.7.0
 	github.com/spf13/afero v1.3.1 // indirect
 	github.com/spf13/cast v1.3.1 // indirect
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/spf13/viper v1.7.1
 	github.com/unrolled/secure v1.0.8
 	github.com/ziutek/mymysql v1.5.4 // indirect
 	golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8
-	golang.org/x/net v0.0.0-20200625001655-4c5254603344 // indirect
 	golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae // indirect
 	golang.org/x/text v0.3.3 // indirect
-	golang.org/x/tools v0.0.0-20200117065230-39095c1d176c
+	golang.org/x/tools v0.0.0-20200812195022-5ae4c3c160a0
 	google.golang.org/protobuf v1.25.0 // indirect
 	gopkg.in/djherbis/atime.v1 v1.0.0 // indirect
 	gopkg.in/djherbis/stream.v1 v1.3.1 // indirect