[Java] Add sinceVersion to samples type for cup holder.

Author: mjpt777

sbe-samples/src/main/resources/example-extension-schema.xml

@@ -7,7 +7,7 @@
                    description="Example schema with extension"
                    byteOrder="littleEndian">
     <types>
-        <type name="cupHolderCount_t" primitiveType="uint8" presence="optional"/>
+        <type name="cupHolderCount_t" primitiveType="uint8" presence="optional" sinceVersion="1"/>
         <composite name="messageHeader" description="Message identifiers and length of message root">
             <type name="blockLength" primitiveType="uint16"/>
             <type name="templateId" primitiveType="uint16"/>