added tests

updated go version and packages

generator/base64_test.go

@@ -0,0 +1,21 @@
+package generator
+
+import (
+	"testing"
+)
+
+func TestGenerator_GenerateBase64(t *testing.T) {
+	g, err := NewGenerator(Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	url, err := g.generateBase64Url([]byte("test://file"))
+	if err != nil {
+		return
+	}
+
+	if url != "dGVzdDovL2ZpbGU" {
+		t.Errorf("url is wrong: %s", url)
+	}
+}