fix 'FileNotFoundError not found in python2' issue

wxpy/api/bot.py

@@ -85,7 +85,7 @@ def __init__(
                 enableCmdQR=console_qr, picDir=qr_path, qrCallback=qr_callback,
                 loginCallback=login_callback, exitCallback=logout_callback
             )
-        except FileNotFoundError as e:
+        except IOError as e:
             if 'xdg-open' in e.strerror:
                 raise Exception('use `console_qr` arg while under pure console environment')
             raise