[py2] Fix SyntaxError due to F string

Signed-off-by: Travis Thieman <[email protected]>

Author: thieman

runtime/Python2/setup.py

@@ -10,5 +10,5 @@
     package_dir={'': 'src'},
     author='Eric Vergnaud, Terence Parr, Sam Harwell',
     author_email='[email protected]',
-    description=f'ANTLR {v} runtime for Python 2.7.12'
-)
+    description='ANTLR %s runtime for Python 2.7.12' % v
+)