Update dependencies and make gofmt

The collector was updated to 0.9.0 upstream

Author: mx-psi

exporter/datadogexporter/config_test.go

@@ -127,4 +127,4 @@ func TestOverrideMetricsURL(t *testing.T) {
 	err := cfg.Sanitize()
 	require.NoError(t, err)
 	assert.Equal(t, cfg.Metrics.Agentless.Endpoint, DebugEndpoint)
-}		   
+}

exporter/datadogexporter/factory.go

@@ -54,19 +54,19 @@ func NewFactory() component.ExporterFactory {
 func createDefaultConfig() configmodels.Exporter {
 	return &Config{
 		API: APIConfig{
-		  	Key: "", // must be set if using API
-		  	Site: "datadoghq.com",
+			Key:  "", // must be set if using API
+			Site: "datadoghq.com",
 		},
-		  
+
 		Metrics: MetricsConfig{
-		  	Mode: DogStatsDMode,
-			
+			Mode: DogStatsDMode,
+
 			DogStatsD: DogStatsDConfig{
 				Endpoint:  "127.0.0.1:8125",
 				Telemetry: true,
 			},
 
-		  	Agentless: AgentlessConfig{
+			Agentless: AgentlessConfig{
 				Endpoint: "", // set during config sanitization
 			},
 		},

exporter/datadogexporter/go.mod

@@ -3,9 +3,9 @@ module github.com/DataDog/opentelemetry-collector-contrib/exporter/datadogexport
 go 1.15
 
 require (
-	github.com/DataDog/datadog-go v3.7.2+incompatible
+	github.com/DataDog/datadog-go v4.0.0+incompatible
 	github.com/census-instrumentation/opencensus-proto v0.3.0
 	github.com/stretchr/testify v1.6.1
-	go.opentelemetry.io/collector v0.8.1-0.20200820203435-961c48b75778
+	go.opentelemetry.io/collector v0.9.0
 	go.uber.org/zap v1.15.0
 )