Bump commons-collections

CVE-2015-6420
diff --git a/pom.xml b/pom.xml
index 7ede48b..c302051 100644
--- a/pom.xml
+++ b/pom.xml
@@ -41,7 +41,7 @@
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
     <version.accumulo>2.0.0-alpha-2</version.accumulo>
-    <version.collections>3.2.1</version.collections>
+    <version.collections>3.2.2</version.collections>
     <version.commons-codec>1.5</version.commons-codec>
     <version.commons-configuration>1.10</version.commons-configuration>
     <version.commons-jexl>2.0.1</version.commons-jexl>