add math3 version to pom

Author: mengxr

core/pom.xml

@@ -70,6 +70,7 @@
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-math3</artifactId>
+      <version>3.3</version>
       <scope>test</scope>
     </dependency>
     <dependency>