Update nano to 2.8.2

2017.05.04 - GNU nano 2.8.2 "Krats" adds another new feature: it makes
the ^G help texts searchable with ^W.  Apart from that,
it fixes a crash when resizing the window in the middle
of verbatim input, avoids an unlikely crash when used
without UTF-8 support in some locales, avoids redrawing
the screen twice when switching between buffers while
line numbers are active, and works around a coloring
bug on musl.  Plus tweaks to the documentation; plus
translation updates for fifteen languages.

(wiedi)