Add a paragraph in history + fixes --arch docs

Author: misl6

README.md

@@ -112,6 +112,9 @@ api level below 21, you should use an older version of python-for-android
 On March of 2020 we dropped support for creating apps that use Python 2. The latest
 python-for-android release that supported building Python 2 was version 2019.10.6.
 
+On August of 2021, We added support for Android App Bundle (aab). As a collateral,
+now We support multi-arch apk.
+
 ## Contributors
 
 This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].

doc/source/commands.rst

@@ -71,8 +71,9 @@ supply those that you need.
   Whether the distribution must be compiled from scratch.
 
 ``--arch``
-  The architecture to build for. Currently only one architecture can be 
-  targeted at a time, and a given distribution can only include one architecture.
+  The architecture to build for. You can specify multiple architectures to build for
+  at the same time. As an example ``p4a ... --arch arm64-v8a --arch armeabi-v7a ...``
+  will build a distribution for both ``arm64-v8a`` and ``armeabi-v7a``.
 
 ``--bootstrap BOOTSTRAP``
   The Java bootstrap to use for your application. You mostly don't