DOC: Note compare widget in README

Author: thewtex

README.rst

@@ -162,6 +162,7 @@ Other available widgets:
 
 - ``itkwidgets.line_profile``: Plot an intensity line profile.
 - ``itkwidgets.checkerboard``: Compare two images in a checkerboard pattern.
+- ``itkwidgets.compare``: Compare two images side-by-side.
 
 Advanced Usage
 ^^^^^^^^^^^^^^

examples/3DImage.ipynb

@@ -41,13 +41,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "application/vnd.jupyter.widget-view+json": {
-       "model_id": "128f87def74b440baed35bb99b28198a",
+       "model_id": "ff7e3fd0c36d47829ba3326ebc805032",
        "version_major": 2,
        "version_minor": 0
       },