Inner class should have been "static".

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1399433 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/math3/optimization/direct/CMAESOptimizer.java

@@ -391,7 +391,7 @@ public class CMAESOptimizer
      * guess).
      * Too small values might however lead to early termination.
      */
-    public class Sigma implements OptimizationData {
+    public static class Sigma implements OptimizationData {
         /** Sigma values. */
         private final double[] sigma;