Update error message when decoding wrong data type (#60)
Update error message when decoding wrong data type (#60)

Old error
`invalid literal for int() with base 10: '5.6'`

new error:
`ValueError: Error decoding field ORM4_WID with value 5.6. Error: invalid literal for int() with base 10: '5.6'`
opendoor-labs/rets,opendoor-labs/rets