Lower the limit for allowed protocol versions.

       sorted by keyword.  Values should be numerically ascending within each

       entry.  (This implies that there should be no overlapping ranges.)

       Ranges should be represented as compactly as possible. Ints must be no

       more than 2^32 - 2. (Yes, 2.)

       larger than 63.

       This field was first added in Tor 0.2.9.x. Some time after all earlier

       Tor relay versions are obsolete, it will become mandatory.