Add two quick Client construction tests.

client_test.go

@@ -0,0 +1,20 @@
+package footballdata
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func Test_Client_New(t *testing.T) {
+	client := NewClient(http.DefaultClient)
+	_, err := client.Competitions().Do()
+	require.Nil(t, err)
+}
+
+func Test_Client_GoNew(t *testing.T) {
+	client := new(Client)
+	_, err := client.Competitions().Do()
+	require.Nil(t, err)
+}