README: report success with ASDF 3.3.2.5

for some build speedup, both through parallelization and reduced GC.

WARNING

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Version Compatibility

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POIU 1.34 is broken: It requires more changes to actually work with a recent

ASDF (3.3.2 or later), yet is modified enough to not work with older ASDF.

POIU 1.34 reportedly passed its test of building and using Exscribe

with ASDF 3.3.2.5 on SBCL 1.4.4 on Linux x86-64.

For a working combination, try POIU 1.31.1 and ASDF 3.1.7 -- which if your

implementation comes with a more recent ASDF

For an older working combination, try POIU 1.31.1 and ASDF 3.1.7

-- which if your implementation comes with a more recent ASDF

(as checked by `(require :asdf) (asdf:asdf-version)`) may require

overriding your implementation's ASDF e.g. using the `tools/install-asdf.lisp`

script from the ASDF source repository at

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POIU 1.34 depends on the new plan-making internals of ASDF 3.3.0,

but for bug fix purposes, we recommend ASDF 3.3.2.2 or later.

but for bug fix purposes, we recommend ASDF 3.3.2.5 or later.

To use POIU, just make sure you use a recent enough ASDF,

and in your build scripts, after you `(require "asdf")`