README: Explicitly mention "await" support, and formatting for keywords.

README.md

@@ -18,13 +18,13 @@ WARNING: this project is in beta stage and is subject to changes of the
 code-base, including project-wide name changes and API changes.
 
 MicroPython implements the entire Python 3.4 syntax (including exceptions,
-"with", "yield from", etc., and additionally "async" keyword from Python 3.5).
-The following core datatypes are provided: str (including basic Unicode
-support), bytes, bytearray, tuple, list, dict, set, frozenset, array.array,
-collections.namedtuple, classes and instances. Builtin modules include sys,
-time, and struct, etc. Select ports have support for _thread module
-(multithreading). Note that only subset of Python 3.4 functionality
-implemented for the data types and modules.
+`with`, `yield from`, etc., and additionally `async`/`await` keywords from
+Python 3.5). The following core datatypes are provided: `str` (including
+basic Unicode support), `bytes`, `bytearray`, `tuple`, `list`, `dict`, `set`,
+`frozenset`, `array.array`, `collections.namedtuple`, classes and instances.
+Builtin modules include `sys`, `time`, and `struct`, etc. Select ports have
+support for `_thread` module (multithreading). Note that only a subset of
+Python 3 functionality is implemented for the data types and modules.
 
 See the repository www.github.com/micropython/pyboard for the MicroPython
 board (PyBoard), the officially supported reference electronic circuit board.