Fix packaging issue

Author: FelixWolf

metaverse/__init__.py

@@ -1 +1 @@
-__version__ = "0.0.3"
+__version__ = "0.0.4"

setup.py

@@ -1,28 +1,32 @@
-from distutils.core import setup
+from setuptools import setup, find_namespace_packages
 from metaverse import __version__ as version
 
-long_description = None
-with open("README.md", "r") as f:
+with open("README.md", "r", encoding="utf-8") as f:
     long_description = f.read()
 
 setup(
     name="Metaverse",
     version=version,
     description="A library for handling Second Life things.",
     long_description=long_description,
-    long_description_content_type="text/markdown" if long_description else None,
+    long_description_content_type="text/markdown",
     url="https://github.com/FelixWolf/pymetaverse",
     author="Félix",
     author_email="felix.wolfz@gmail.com",
-    packages=["metaverse"],
+    packages=find_namespace_packages(),
+    include_package_data=True,
+    package_data={
+        "metaverse.viewer": [
+            "message_template/*",
+        ],
+    },
+    license="Zlib",
     classifiers=[
         "Development Status :: 3 - Alpha",
-        "Intended Audience :: Developers", 
+        "Intended Audience :: Developers",
         "Natural Language :: English",
         "Operating System :: OS Independent",
-        "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "License :: OSI Approved :: zlib/libpng License",
         "Topic :: Software Development :: Libraries"
     ]
 )