form-urlencoded: Allow to encode key parameters without a values #547
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According to #546
Add methods:
- Serializer::append_key_only(&mut self, name: &str) -> &mut Self;
- Serializer::extend_keys_only<I, K>(&mut self, iter: I) -> &mut Self;
in order to allow query parameters without a values like:
- https://example.org/exchange?date=20190915&json
- https://example.org/exchange?date=20190915&xml
- https://example.org/exchange?date=20190915&bin
This change is