Bump version to 2.1.8 (20108)

Change-Id: Ia9214373bca532014bc246b4811a00f66e877778
diff --git a/app/build.gradle b/app/build.gradle
index f6de22e..71d0ce2 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -46,10 +46,10 @@
         targetSdkVersion 23
 
         // Defines the version number of your app.
-        versionCode 20107
+        versionCode 20108
 
         // Defines a user-friendly version name for your app.
-        versionName "2.1.7"
+        versionName "2.1.8"
     }
     /**
      * The buildTypes {} block is where you can configure multiple build types.