[funfuzz] RuntimeWarning shown when running in Python 3.5+

[nth10sd]

When running funfuzz under Python 3.5+, RuntimeWarnings similar to the following may show up:

RuntimeWarning: 'funfuzz.js.compile_shell' found in sys.modules after import of package 'funfuzz.js', but prior to execution of 'funfuzz.js.compile_shell'; this may result in unpredictable behaviour warn(RuntimeWarning(msg))

[nth10sd]

Option 1 from here may be the solution.