add channel patch/delete

http_test.go

@@ -0,0 +1,11 @@
+package nano
+
+import "testing"
+
+func TestWriteHTTPQueryIfNotNil(t *testing.T) {
+	expstr := "https://api.sgroup.qq.com/testapi?b=1&d=0.5"
+	str := WriteHTTPQueryIfNotNil(StandardAPI+"/testapi", "a", 0, "b", 1, "c", "", "d", 0.5)
+	if str != expstr {
+		t.Fatal("expected", expstr, "but got", str)
+	}
+}