Bump commons-io from 2.4 to 2.6

Bumps commons-io from 2.4 to 2.6.

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-preview[bot]

build.gradle

@@ -25,7 +25,7 @@ repositories {
 
 dependencies {
     compile group: 'com.google.code.gson', name: 'gson', version: '2.6.2'
-    compile group: 'commons-io', name: 'commons-io', version: '2.4'
+    compile group: 'commons-io', name: 'commons-io', version: '2.6'
     compile group: 'org.apache.ant', name: 'ant', version: '1.10.7'
     compile group: 'com.beust', name: 'jcommander', version: '1.72'