Bump versions for Spark2.3.1 & Flink1.5.0

Author: GezimSejdiu

pom.xml

@@ -58,8 +58,8 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<scala.version>2.11.11</scala.version>
 		<scala.binary.version>2.11</scala.binary.version>
-		<spark.version>2.2.1</spark.version>
-		<flink.version>1.4.0</flink.version>
+		<spark.version>2.3.1</spark.version>
+		<flink.version>1.5.0</flink.version>
 		<hadoop.version>2.7.0</hadoop.version>
 		<jena.version>3.5.0</jena.version>
 		<sansa.version>0.3.1-SNAPSHOT</sansa.version>