update to latest jar-pom, fastutil 8 requires jdk 8

Author: ranade

pom.xml

@@ -3,7 +3,7 @@
   <parent>
     <artifactId>jar-pom</artifactId>
     <groupId>com.addthis.common.build.maven.pom</groupId>
-    <version>3.4.0</version>
+    <version>3.8.0</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>
@@ -22,7 +22,7 @@
   </licenses>
 
  <properties>
-    <project.build.targetJdk>1.7</project.build.targetJdk>
+    <project.build.targetJdk>1.8</project.build.targetJdk>
   </properties>
 
   <dependencies>