Browser compat #9
                
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This fixes #7 and #8 by adding support for targeting the browser environment.
Note that iconv-lite is also made optional in case the downstream user doesn't want to take the size hit and is fine only supporting UTF-8 and ASCII. One open question is whether unsupported charsets should be rejected with a RangeError instead of silently failing to decode. Such a change wouldn't be backward compatible but maybe there's a "strict" option
that could be added to decode to control that behavior.