core/src/main/java/org/trimou/engine/MustacheEngineBuilder.java
public MustacheEngineBuilder addContextConverter(ContextConverter converter) {
        checkArgumentNotNull(converter);
        checkNotBuilt();
        this.contextConverters.add(converter);
        return this;
    }
public MustacheEngineBuilder addContextConverter(ContextConverter converter) {
        checkArgumentNotNull(converter);
        checkNotBuilt();
        this.contextConverters.add(converter);
        return this;
    }
Add a context converter.

@param converter
@return self