error strings should not be capitalized

Signed-off-by: Benoit Tigeot <benoit.tigeot@lifen.fr>

pkg/cmd/repo_update.go

@@ -137,7 +137,7 @@ func updateCharts(repos []*repo.ChartRepository, out io.Writer) error {
 	}
 
 	if len(repoFailList) > 0 {
-		return fmt.Errorf("Failed to update the following repositories: %s",
+		return fmt.Errorf("failed to update the following repositories: %s",
 			repoFailList)
 	}
 

pkg/cmd/repo_update_test.go

@@ -193,7 +193,7 @@ func TestUpdateChartsFailWithError(t *testing.T) {
 		t.Error("Repo update should return error because update of repository fails and 'fail-on-repo-update-fail' flag set")
 		return
 	}
-	var expectedErr = "Failed to update the following repositories"
+	var expectedErr = "failed to update the following repositories"
 	var receivedErr = err.Error()
 	if !strings.Contains(receivedErr, expectedErr) {
 		t.Errorf("Expected error (%s) but got (%s) instead", expectedErr, receivedErr)