Make enter_notify_event deprecation more explicit.

QuLogic · QuLogic · commit 0365e18144bd · 2020-04-25T00:13:04.000-04:00
Since this did not previously note a removal version, I bumped it to 3.5
(assuming this is merged for 3.3.)
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -1837,8 +1837,10 @@ def enter_notify_event(self, guiEvent=None, xy=None):
             x = None
             y = None
             cbook.warn_deprecated(
-                '3.0', message='enter_notify_event expects a location but '
-                'your backend did not pass one.')
+                '3.0', removal='3.5', name='enter_notify_event',
+                message='Since %(since)s, %(name)s expects a location but '
+                'your backend did not pass one. This will become an error '
+                '%(removal)s.')
 
         event = LocationEvent('figure_enter_event', self, x, y, guiEvent)
         self.callbacks.process('figure_enter_event', event)
