public B withFields(Collection<String> fieldNames) {
            for (String fieldName : fieldNames) {
                withField(fieldName);
            }
            return (B)this;
        }
Specify a set of additional fields that we want to retrieve.
@param fieldNames The collection of names of the additional fields
@return the current Builder instance.
analyzer/src/main/java/nl/basjes/parse/useragent/AbstractUserAgentAnalyzerDirect.java