Remove dependency on antlr runtime

pip cannot handle it properly

setup.py

@@ -20,7 +20,6 @@ setup(
     description='A tiny, free SDL editor for TASTE',
     long_description=open('README.md').read(),
     install_requires=[
-        'antlr_python_runtime',
         'pygraphviz',
         'singledispatch',
     ],