os: Add urandom().

os/metadata.txt

@@ -1,4 +1,4 @@
 srctype = micropython-lib
 type = package
-version = 0.0.9
+version = 0.1
 author = Paul Sokolovsky

os/os/__init__.py

@@ -173,3 +173,8 @@ def fsdecode(s):
     if type(s) is str:
         return s
     return str(s, "utf-8")
+
+
+def urandom(n):
+    with open("/dev/urandom", "rb") as f:
+        return f.read(n)

os/setup.py

@@ -6,7 +6,7 @@ from setuptools import setup
 
 
 setup(name='micropython-os',
-      version='0.0.9',
+      version='0.1',
       description='os module for MicroPython',
       long_description="This is a module reimplemented specifically for MicroPython standard library,\nwith efficient and lean design in mind. Note that this module is likely work\nin progress and likely supports just a subset of CPython's corresponding\nmodule. Please help with the development if you are interested in this\nmodule.",
       url='https://github.com/micropython/micropython/issues/405',