Update Hawk to 1.21

Author: rubengees

app/build.gradle

@@ -29,7 +29,7 @@ dependencies {
     compile 'com.android.support:percent:23.1.1'
 
     compile 'com.jakewharton:butterknife:7.0.1'
-    compile 'com.github.orhanobut:hawk:1.20'
+    compile 'com.github.orhanobut:hawk:1.21'
     compile 'net.danlew:android.joda:2.9.1'
     compile 'com.github.bumptech.glide:glide:3.6.1'
     compile 'com.mikepenz:iconics-core:2.5.1@aar'