Update setup.py, remove libtmux package

Author: tony

setup.py

@@ -55,7 +55,7 @@ def run_tests(self):
     author_email=about['__email__'],
     description=about['__description__'],
     long_description=readme,
-    packages=['tmuxp', 'libtmux'],
+    packages=['tmuxp'],
     include_package_data=True,
     install_requires=install_reqs,
     tests_require=tests_reqs,