Fix the casing of github.com/Sirupsen/logrus to match what the project itself uses. (#380)

Dep enforces this.

pkg/util/patroni/patroni.go

@@ -8,7 +8,7 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/Sirupsen/logrus"
+	"github.com/sirupsen/logrus"
 	"k8s.io/api/core/v1"
 )
 

pkg/util/teams/teams.go

@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"strings"
 
-	"github.com/Sirupsen/logrus"
+	"github.com/sirupsen/logrus"
 )
 
 // InfrastructureAccount defines an account of the team on some infrastructure (i.e AWS, Google) platform.

pkg/util/teams/teams_test.go

@@ -7,7 +7,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/Sirupsen/logrus"
+	"github.com/sirupsen/logrus"
 )
 
 var (