Update GDSC IJ Parent to v3.0

Author: aherbert

pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>uk.ac.sussex.gdsc</groupId>
     <artifactId>gdsc-ij-parent</artifactId>
-    <version>3.0-SNAPSHOT</version>
+    <version>3.0</version>
     <relativePath>../gdsc-ij-parent</relativePath>
   </parent>