python-parsley: add python3 variant

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/python-parsley/patches/001-py3-read-utf8.patch

@@ -0,0 +1,19 @@
+--- a/setup.py
++++ b/setup.py
+@@ -4,6 +4,7 @@
+ Setup script for the Parsley distribution.
+ """
+ 
++import io
+ from distutils.core import setup
+ setup(
+     name="Parsley",
+@@ -13,7 +14,7 @@ setup(
+     author="Allen Short",
+     author_email="washort42@gmail.com",
+     license="MIT License",
+-    long_description=open("README").read(),
++    long_description=io.open("README", encoding="utf-8").read(),
+     packages=["ometa", "terml", "ometa._generated", "terml._generated",
+               "ometa.test", "terml.test"],
+     py_modules=["parsley"]