update_metadata_values_to_string

[sjrojanooo]

Delta Lake now has column mapping features that lets you rename a column. This change is only reflected in the and enables metadata only changes. The read and writer version are saved as integers and should be converted to strings. The function simply converts all of the values in the metadata dictionary into string values to avoid the error.

[jeppe742]

fixed in #50

[sjrojanooo]

@jeppe742 awesome, thank you!