Visual mc: `evil-insert-state' for all cursors (#114)

`evil-mc-make-cursor-in-visual-selection-beg' and
`evil-mc-make-cursor-in-visual-selection-end' now enter insert state for all
cursors.

evil-mc-cursor-make.el

@@ -501,7 +501,7 @@ Acts like the I key in evil-visual-state."
              (min (evil-column evil-visual-beginning)
                   (evil-column evil-visual-end)))
           (evil-mc-make-cursor-in-visual-selection t))
-        (evil-insert-state))
+        (evil-mc-execute-for-all-cursors #'evil-insert-state))
     (message "%s: Only works with a selection" this-command)))
 
 (evil-define-command evil-mc-make-cursor-in-visual-selection-end ()
@@ -516,7 +516,7 @@ Acts like the A key in evil-visual-state."
              (max (evil-column evil-visual-beginning)
                   (evil-column evil-visual-end)))
           (evil-mc-make-cursor-in-visual-selection nil))
-        (evil-insert-state))
+        (evil-mc-execute-for-all-cursors #'evil-insert-state))
     (message "%s: Only works with a selection" this-command)))
 
 (evil-define-command evil-mc-make-cursor-move-next-line (count)