Change rootCommands to fit Android API level 24
diff --git a/app/build.gradle b/app/build.gradle
index 8462e2d..ba0b5bd 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -18,7 +18,7 @@
 
     defaultConfig {
         applicationId "masquerade.substratum"
-        minSdkVersion 23
+        minSdkVersion 21
         targetSdkVersion 23
         versionCode 12
         versionName "twelve"