Fixes visibility of Vector3 method.

rosjava_geometry/src/main/java/org/ros/rosjava_geometry/Vector3.java

@@ -98,7 +98,7 @@ public class Vector3 {
     return z;
   }
 
-  private double getMagnitudeSquared() {
+  public double getMagnitudeSquared() {
     return x * x + y * y + z * z;
   }