update
diff --git a/app/build.gradle b/app/build.gradle
index 42243f7..cb09029 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -21,6 +21,10 @@
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
+        debug {
+            applicationIdSuffix '.debug'
+            versionNameSuffix ' DEBUG'
+        }
     }
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8