v0.3.1

ProteinChains v0.3.1

Diff since v0.3.0

• Add ProteinStructureStore(f::Function, ::Type{ProteinStructureStore}, args...), enabling do syntax for ensuring closure.
• Define Base.open(::Type{ProteinStructureStore}, args...) method, with do syntax supported.
• Fix parsing of atom names with tags wider than 2 characters.
• Avoid constructing MMCIF dictionary multiple times when reading.