Bump commons-io from 2.5 to 2.6

Bumps commons-io from 2.5 to 2.6.

Signed-off-by: dependabot[bot] <support@dependabot.com>

build.gradle

@@ -222,7 +222,7 @@ dependencies {
     implementation "com.android.support:exifinterface:${supportLibraryVersion}"
     implementation 'com.github.albfernandez:juniversalchardet:2.1.0'
     implementation 'com.google.code.findbugs:annotations:2.0.1'
-    implementation 'commons-io:commons-io:2.5'
+    implementation 'commons-io:commons-io:2.6'
     implementation 'com.github.evernote:android-job:v1.2.5'
     implementation 'com.jakewharton:butterknife:8.8.1'
     annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'