Use API 21

Author: bryant1410

rxsimplenosql/build.gradle

@@ -1,12 +1,12 @@
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion '23.0.3'
+    compileSdkVersion 21
+    buildToolsVersion '21.1.2'
 
     defaultConfig {
         minSdkVersion 8
-        targetSdkVersion 23
+        targetSdkVersion 21
         versionCode 1
         versionName '0.1'
     }