Fix readline.get_line_buffer: return unicode on py3 (#13)

Author: blueyed

pyrepl/readline.py

@@ -358,6 +358,8 @@ def set_startup_hook(self, function=None):
         self.startup_hook = function
 
     def get_line_buffer(self):
+        if PY3:
+            return self.get_reader().get_unicode()
         return self.get_reader().get_buffer()
 
     def _get_idxs(self):