Add android as supported platform (#130)

* Add android to list for platfrom-checks
* list termux as an untested platform in README.md

Author: Mause

README.md

@@ -115,6 +115,7 @@ Some operating systems are enabled, but not actively tested or supported:
 
 - macOS
 - FreeBSD / OpenBSD
+- Android
 
 Theoretically every Unix based system should work, but they will not be actively tested.
 It is also required that somebody provides initial test results before the OS is enabled

readchar/__init__.py

@@ -11,7 +11,7 @@
 from ._config import config
 
 
-if platform.startswith(("linux", "darwin", "freebsd", "openbsd")):
+if platform.startswith(("linux", "darwin", "freebsd", "openbsd", "android")):
     from . import _posix_key as key
     from ._posix_read import readchar, readkey
 elif platform in ("win32", "cygwin"):