upgrade maven compiler version to 1.8

Author: kamal-kaur04

pom.xml

@@ -12,8 +12,8 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>1.6</maven.compiler.source>
-        <maven.compiler.target>1.6</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
         <testng.version>7.4.0</testng.version>
         <surefire.version>2.19.1</surefire.version>
         <selenium.version>3.141.59</selenium.version>