public String put(String key, String value) {
		if (value != null) {
			return values.put(key, value);
		} else {
			return remove(key);
		}
	}
Sets the given key to the given value in this Configuration. Passing `null`
as a value is the same as calling `remove()`.

@param key   The key of the value to set
@param value The new value for the given key
@return The old value for the given key or `null`
src/main/java/dev/jbang/Configuration.java