[spec] Limit valid encodings of text/gemini to UTF-8

[Philip Linde]

Note also, regarding the current discussion about IRI, that if IRI is
adopted and the community later adopts a different (UTF-8
incompatible) standard encoding, the way IRI is implemented has to
change, or we lose its benefits entirely when we implement a
galaxy-grade encoding in the year 2121 and still have to deal with
UTF-8 IRI.

Even if IRI is decided against, by requiring URI at all, we're betting
that this hypothetical future encoding will be ASCII-compatible, or
we're giving client authors the additional burden of transcoding.

-- 
Philip
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