calcurse-caldav: Encode the request body in UTF-8

When a string is passed to HTTPConnection.request(), it is automatically
ISO 8859-1 encoded. Therefore, since we already specify UTF-8 as
character set in the headers, we need to UTF-8 encode the request body
manually.

Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

contrib/caldav/calcurse-caldav.py

@@ -108,6 +108,9 @@ def remote_query(conn, cmd, path, additional_headers, body):
                 print("> " + line)
         print()
 
+    if isinstance(body, str):
+        body = body.encode('utf-8')
+
     conn.request(cmd, path, headers=headers, body=body)
 
     resp = conn.getresponse()