[feature] Add support for Excel source files #766
Description
Is your feature request related to a problem? Please describe.
In our company we often use Microsoft Excel to compose data we want to upload to Salesforce. Unfortunately it's currently not possible to use these Excel sheets directly as a datasource inside of the Data Loader.
Describe the solution you'd like
Alternatively to CSV files, add support for .xlsx-files, too.
Describe alternatives you've considered
The current workaround is to create CSV files from the mentioned Excel files and use these as datasource.
Additional context
If you're willing to implement such a feature, I'd be glad to help 👍