Revert increasing buildToolsVersion and targetSdkVersion.

Author: DylanVann

android/build.gradle

@@ -13,9 +13,9 @@ def _ext = rootProject.ext
 
 def _reactNativeVersion = _ext.has('reactNative') ? _ext.reactNative : '+'
 def _compileSdkVersion = _ext.has('compileSdkVersion') ? _ext.compileSdkVersion : 23
-def _buildToolsVersion = _ext.has('buildToolsVersion') ? _ext.buildToolsVersion : '27.0.3'
+def _buildToolsVersion = _ext.has('buildToolsVersion') ? _ext.buildToolsVersion : '23.0.1'
 def _minSdkVersion = _ext.has('minSdkVersion') ? _ext.minSdkVersion : 16
-def _targetSdkVersion = _ext.has('targetSdkVersion') ? _ext.targetSdkVersion : 27
+def _targetSdkVersion = _ext.has('targetSdkVersion') ? _ext.targetSdkVersion : 22
 
 android {
     compileSdkVersion _compileSdkVersion