AAPT2: Update version and readme

Update version to 2.2 and update readme to reflect added
support for inline complex XML resources.

Change-Id: If825c96541952e95860d34390c6c36704a24129b

tools/aapt2/Main.cpp

@@ -25,7 +25,7 @@ namespace aapt {
 static const char* sMajorVersion = "2";
 
 // Update minor version whenever a feature or flag is added.
-static const char* sMinorVersion = "1";
+static const char* sMinorVersion = "2";
 
 int printVersion() {
     std::cerr << "Android Asset Packaging Tool (aapt) "

tools/aapt2/readme.md

@@ -1,5 +1,10 @@
 # Android Asset Packaging Tool 2.0 (AAPT2) release notes
 
+## Version 2.2
+### `aapt2 compile ...`
+- Added support for inline complex XML resources. See
+  https://developer.android.com/guide/topics/resources/complex-xml-resources.html
+
 ## Version 2.1
 ### `aapt2 link ...`
 - Configuration Split APK support: supports splitting resources that match a set of