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travis-ci

Return a function from utils.memoize instead of a table

First, documentation says it should return a function; second,
attempting to serialize memoization table may result in an error:
on Lua 5.3 ipairs() uses __index metamethod which may not work
if the function doesn't take numbers as arguments.

Fixes pl.pretty.write(_G) crashing on Lua 5.3.

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