New signature: no matching key exchange method

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Issue #34 resolved
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Hi there, script-kiddies bomb me with with these attacks, more than 50 per hour and spamming my logs. Due to an old key exchange auth method that my sshd does not support, they not able to go further, but in this case they are also not detected by sshguard... An attack signature for this kind of attacl would be very helpful to block those attempts. Should be an easy task :-) Thanks in advance!

sshd[XXXX]: fatal: Unable to negotiate with XXX.XXX.XXX.XXX port XXXXX: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1.............

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