v9.4.0
1. ports spec tests from js-multibase 2. adds missing identity/base2/8/10 base encodings 3. Standardises error messages - before you might get `'invalid base32upper character'` or `'Non-base32 character'` depending on if rfc4648 or base-x was used (also notice the base name change in the error message), now you always get `'Non-base32upper character'`