v5.1.3

BioSymbols v5.1.3

Diff since v5.1.2

Merged pull requests:

• Improve error on predefined convert(::BioSymbol, ::Char) (#57) (@jakobnissen)
• Migrate from SnoopPrecompile to PrecompileTools (#58) (@timholy)
• Bump version to v5.1.3 (#59) (@jakobnissen)