fix 'connectionTimeoutInMs' mismatch with actual usage (#57)

Author: citrusreticulata

README.md

@@ -108,3 +108,12 @@ The interfaces changed in the two versions are as follows:
 2. `NewTFramedTransport` has been deprecated, use `NewTFramedTransportConf` instead.
 
 For more details, please take a look at this PR: [update thrift to 0.15.0 to fit IoTDB 0.13.0](https://github.com/apache/iotdb-client-go/pull/41)
+
+### Parameter name mismatch with actual usage in function 'Open'
+
+The implementation of the function ```client/session.go/Open()``` is mismatched with the description.
+The parameter `connectionTimeoutInMs` represents connection timeout in milliseconds.
+However, in the older version, this function did not implement correctly, regarding it as nanosecond instead.
+The bug is now fixed.
+Positive value of this parameter means connection timeout in milliseconds.
+Set 0 for no timeout.

README_ZH.md

@@ -104,3 +104,9 @@ go run session_example.go
 2. `NewTFramedTransport`已弃用，改用为`NewTFramedTransportConf`。
 
 更多相关的内容可以参考这个PR：[update thrift to 0.15.0 to fit IoTDB 0.13.0](https://github.com/apache/iotdb-client-go/pull/41)
+
+### Open函数参数名称与实际功能不匹配的问题
+
+函数```client/session.go/Open()```有一个参数`connectionTimeoutInMs`，表示了以毫秒为单位的连接超时时间。
+但旧版本中，该函数在实现时并未正确进行单位转换，而是将其看作了纳秒。现在该问题已修复。
+当该参数为0时，表示不设置超时时间；当设置为正数时表示以毫秒为单位的超时时间。

client/session.go

@@ -81,7 +81,7 @@ func (s *Session) Open(enableRPCCompression bool, connectionTimeoutInMs int) err
 
 	// in thrift 0.14.1, this func returns two values; in thrift 0.15.0, it returns one.
 	s.trans = thrift.NewTSocketConf(net.JoinHostPort(s.config.Host, s.config.Port), &thrift.TConfiguration{
-		ConnectTimeout: time.Duration(connectionTimeoutInMs), // Use 0 for no timeout
+		ConnectTimeout: time.Duration(connectionTimeoutInMs) * time.Millisecond, // Use 0 for no timeout
 	})
 	if err != nil {
 		return err