Rename TopkIncrBy method

Author: dengliming

client.go

@@ -206,7 +206,7 @@ func (client *Client) TopkInfo(key string) (map[string]string, error) {
 }
 
 // Increase the score of an item in the data structure by increment.
-func (client *Client) TopkIncrby(key string, itemIncrements map[string]int64) ([]string, error) {
+func (client *Client) TopkIncrBy(key string, itemIncrements map[string]int64) ([]string, error) {
 	conn := client.Pool.Get()
 	defer conn.Close()
 	args := redis.Args{key}

client_test.go

@@ -202,7 +202,7 @@ func TestClient_TopkIncrby(t *testing.T) {
 	assert.Nil(t, err)
 	assert.NotNil(t, rets)
 
-	rets, err = client.TopkIncrby(key, map[string]int64{"foo": 3, "bar": 2, "42": 30})
+	rets, err = client.TopkIncrBy(key, map[string]int64{"foo": 3, "bar": 2, "42": 30})
 	assert.Nil(t, err)
 	assert.Equal(t, 3, len(rets))
 	assert.Equal(t, "", rets[2])