Updated the spark archetype for spark 2.8.0

Author: jschwartz73

archetypes/spark/src/main/resources/archetype-resources/pom.xml

@@ -16,7 +16,7 @@
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <jackson.version>2.9.5</jackson.version>
-        <spark.version>2.7.2</spark.version>
+        <spark.version>2.8.0</spark.version>
     </properties>
 
     <dependencies>