[types] Reorder methods to fix type checking.

It's weird that this matters... but this is how I would have ordered the
methods anyway!

frontend/reader.py

@@ -69,6 +69,11 @@ def __init__(self, arena, prompt_ev, hist_ev, line_input, prompt_state,
 
     self.Reset()
 
+  def Reset(self):
+    # type: () -> None
+    """Called after command execution."""
+    self.render_ps1 = True
+
   def _GetLine(self):
     # type: () -> Optional[str]
 
@@ -106,11 +111,6 @@ def _GetLine(self):
     self.render_ps1 = False
     return line
 
-  def Reset(self):
-    # type: () -> None
-    """Called after command execution."""
-    self.render_ps1 = True
-
 
 class FileLineReader(_Reader):
   """For -c and stdin?"""