failing decoder tests

[martijnhoekstra]

in master and series 0.2 (which I hoped to bump to the M8 release of fs2)

! ChunkedEncoding.encode-decode: Falsified after 3 passed tests.
! util.decodes.base64: Falsified after 3 passed tests.

fiddling around a bit with the tests, to give me vectors of code units to have something printable:

[info] > Labels of failing property:
[info] Expected Vector(Right(Vector(62875, 60936, 24080))) but got Vector(Right(Vector(63, 63, 63)))

Note that code unit 63 encodes ?, and 62875 and 60936 are in the private use area.

[pchlupacek]

@martijnhoekstra thanks I'll look into that