Raising FDSNTooManyRequestsException in error handling typo

[fabgiamp]

Hello,
according to this code, present also in the current version (1.3.1):

obspy/obspy/clients/fdsn/client.py

Lines 1836 to 1838 in 0d77efd

	msg = ("Sent too many requests in a given amount of time ('rate "
	"limiting'). Wait before making a new request.", server_info)
	raise FDSNTooManyRequestsException(msg, server_info)

the first argument of the mentioned exception appears to be a tuple. This causes a TypeError when effectively too many requests are done and the FDSNTooManyRequestsException raises:

TypeError: sequence item 0: expected str instance, tuple found

It seems to be a small typo since the other exceptions have simple strings as first argument.

[megies]

It seems to be a small typo since the other exceptions have simple strings as first argument.

yep seems like a copy-paste problem. Thanks!