Add a keyword argument to Layout that allows for empty columns to be present in the file without throwing an error.
Still needs docs to be updated to show this, but the functionality is there.
0.5.4
Better configure ExcelFile reading to support correct parsing of formula values (rather than the formulas themselves), along with a read-only argument that improves performance.
0.5.3
Correcting an error which prevented the `ExcelFile` params from passing the specified sheet for validation.
0.5.2
Implements a correction to row handling when a nullable cell is present.
0.5.1
Missed some typehint and other documentation touches