fix: Update tooltip after changing alpha

Author: Valer100

tktooltip/tooltip.py

@@ -155,6 +155,7 @@ def animation():
             self.wm_attributes("-alpha", 1)
 
             for i in range(11):
+                self.update()
                 self.wm_attributes("-alpha", 0.1 * (10 - i))
                 time.sleep(0.01)
 
@@ -216,6 +217,7 @@ def animation():
                     self.wm_attributes("-alpha", 0)
 
                     for i in range(11):
+                        self.update()
                         self.wm_attributes("-alpha", 0.1 * i)
                         time.sleep(0.01)