Upgrade eclipse-jarsigner-plugin to 1.1.6

Change-Id: Iae7ebfe24bec19c0b56a325ab38384cdb05d3d90
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
diff --git a/pom.xml b/pom.xml
index 992ff95..2ad57b5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -351,7 +351,7 @@
         <plugin>
           <groupId>org.eclipse.cbi.maven.plugins</groupId>
           <artifactId>eclipse-jarsigner-plugin</artifactId>
-          <version>1.1.5</version>
+          <version>1.1.6</version>
         </plugin>
         <plugin>
           <groupId>org.eclipse.tycho.extras</groupId>