Update rply to 0.7.5

Closes #1313. Ref. alex/rply#52, alex/rply#71.

setup.py

@@ -30,7 +30,7 @@ def run(self):
                         "." + filename[:-len(".hy")])
         install.run(self)
 
-install_requires = ['rply>=0.7.0', 'astor>=0.5', 'clint>=0.4']
+install_requires = ['rply>=0.7.5', 'astor>=0.5', 'clint>=0.4']
 if os.name == 'nt':
     install_requires.append('pyreadline>=2.1')