core/src/main/java/org/trimou/engine/MustacheEngineBuilder.java
public MustacheEngineBuilder addValueConverter(ValueConverter converter) {
        checkArgumentNotNull(converter);
        checkNotBuilt();
        this.valueConverters.add(converter);
        return this;
    }
public MustacheEngineBuilder addValueConverter(ValueConverter converter) {
        checkArgumentNotNull(converter);
        checkNotBuilt();
        this.valueConverters.add(converter);
        return this;
    }
Add a value converter.

@param converter
@return self