Added tk version

src/PIL/_tkinter_finder.py

@@ -1,9 +1,12 @@
 """ Find compiled module linking to Tcl / Tk libraries
 """
 import sys
+import tkinter
 from tkinter import _tkinter as tk
 
 if hasattr(sys, "pypy_find_executable"):
     TKINTER_LIB = tk.tklib_cffi.__file__
 else:
     TKINTER_LIB = tk.__file__
+
+tk_version = str(tkinter.TkVersion)

src/PIL/features.py

@@ -9,7 +9,7 @@ from . import Image
 
 modules = {
     "pil": ("PIL._imaging", "PILLOW_VERSION"),
-    "tkinter": ("PIL._tkinter_finder", None),
+    "tkinter": ("PIL._tkinter_finder", "tk_version"),
     "freetype2": ("PIL._imagingft", "freetype2_version"),
     "littlecms2": ("PIL._imagingcms", "littlecms_version"),
     "webp": ("PIL._webp", "webpdecoder_version"),