update user-agent to cos-python-sdk-v5.3.2

Author: dt3310321

qcloud_cos/cos_client.py

@@ -143,7 +143,7 @@ def send_request(self, method, url, timeout=30, **kwargs):
             timeout = self._conf._timeout
         if self._conf._token is not None:
             kwargs['headers']['x-cos-security-token'] = self._conf._token
-        kwargs['headers']['User-Agent'] = 'cos-python-sdk-v5.3.1'
+        kwargs['headers']['User-Agent'] = 'cos-python-sdk-v5.3.2'
         try:
             for j in range(self._retry):
                 if method == 'POST':