Update readline.c for REPL Unicode issue 1905 #2631
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The issue reported in #1905 was that UTF-8 characters were not getting echoed in REPL. This was because the code in readline.c made sure the character was 'printable', i.e. between 32 and 126 inclusive. For UTF-8 the character can go up to 255, so simply removing the upper test resolves the issue. A simple test: