Added astroquery user-agent to TapPlus module

Author: imbasimba

astroquery/utils/tap/conn/tapconn.py

@@ -23,6 +23,7 @@
     import httplib
 import mimetypes
 import time
+from astroquery import version
 
 from six.moves.urllib.parse import urlencode
 
@@ -124,7 +125,8 @@ def __interna_init(self):
         self.__tapContext = None
         self.__postHeaders = {
             "Content-type": CONTENT_TYPE_POST_DEFAULT,
-            "Accept": "text/plain"
+            "Accept": "text/plain",
+            "User-Agent": 'astropy:astroquery.{vers}'.format(vers=version.version)
             }
         self.__getHeaders = {}
         self.__cookie = None