Add missing delegation method. Fix FasterXML/jackson-dataformat-xml#97.

Author: Pascal Gélinas

src/main/java/com/fasterxml/jackson/core/util/JsonParserDelegate.java

@@ -90,6 +90,7 @@ public JsonParser setFeatureMask(int mask) {
     @Override public String getCurrentName() throws IOException, JsonParseException { return delegate.getCurrentName(); }
     @Override public JsonLocation getCurrentLocation() { return delegate.getCurrentLocation(); }
     @Override public JsonStreamContext getParsingContext() { return delegate.getParsingContext(); }
+    @Override public boolean isExpectedStartArrayToken() { return delegate.isExpectedStartArrayToken(); }
 
     /*
     /**********************************************************