Fix issues raised by golangci-lint (#29)

These popped up when invoking `make`.

Co-authored-by: Liz Fong-Jones <lizf@honeycomb.io>

exporters/metric/datadog/datadog.go

@@ -6,6 +6,7 @@ import (
 	"regexp"
 
 	"github.com/DataDog/datadog-go/statsd"
+
 	"go.opentelemetry.io/otel/api/core"
 	export "go.opentelemetry.io/otel/sdk/export/metric"
 	"go.opentelemetry.io/otel/sdk/export/metric/aggregator"

exporters/metric/datadog/example_test.go

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"github.com/DataDog/sketches-go/ddsketch"
+
 	"go.opentelemetry.io/contrib/exporters/metric/datadog"
 	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/api/metric"

exporters/metric/dogstatsd/go.mod

@@ -6,4 +6,3 @@ require (
 	github.com/stretchr/testify v1.5.1
 	go.opentelemetry.io/otel v0.4.3
 )
-

exporters/metric/dogstatsd/go.sum

@@ -34,9 +34,6 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
-go.opentelemetry.io v0.1.0 h1:EANZoRCOP+A3faIlw/iN6YEWoYb1vleZRKm1EvH8T48=
-go.opentelemetry.io/otel v0.4.2 h1:nT+GOqqRR1cIY92xmo1DeiXLHtIlXH1KLRgnsnhuNrs=
-go.opentelemetry.io/otel v0.4.2/go.mod h1:OgNpQOjrlt33Ew6Ds0mGjmcTQg/rhUctsbkRdk/g1fw=
 go.opentelemetry.io/otel v0.4.3 h1:CroUX/0O1ZDcF0iWOO8gwYFWb5EbdSF0/C1yosO+Vhs=
 go.opentelemetry.io/otel v0.4.3/go.mod h1:jzBIgIzK43Iu1BpDAXwqOd6UPsSAk+ewVZ5ofSXw4Ek=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=

exporters/metric/dogstatsd/labels_test.go

@@ -31,11 +31,6 @@ var testLabels = []core.KeyValue{
 	key.Float64("E", 1.5),
 }
 
-var testResources = []core.KeyValue{
-	key.String("R1", "V1"),
-	key.String("R2", "V2"),
-}
-
 func TestLabelSyntax(t *testing.T) {
 	encoder := dogstatsd.NewLabelEncoder()