Ungraceful exit from repl (for any charCode > 128) when Char.fromCode charCode

[kkruups]

Issue:
Keycodes greater than 128 cause elm-repl to exit ungracefully.

Exhibited Behavior
Exits from repl with following Error:
elm-repl: fd:4: hGetContents: invalid argument (invalid byte sequence)

Expected Behavior: Exception Handled without exiting elm-repl

(additional info: not handling multi-byte byte character codes, on Japanese system start at from char code 129)

Code to recreate Issue in Repl:

    import Char
    
    Char.fromCode 129  -- (or higher)

Environment:
Win7 SP1
default_locale: ('ja_JP', 'cp932')

[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

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