bump to 0.5.6.1 dependency security fix notebook >=6.4.7

Author: gutow

README.md

@@ -142,6 +142,8 @@ Simply replace `$ pip install jupyter-instructortools` with
 `$ pip install -e ../jupyter-instructortools` in the _Production_ instructions.
 
 ### Change Log
+  * 0.5.6.1 require notebook version >=6.4.7 for html styling and security 
+    fixes.
   * 0.5.6
     * Expanded highlight bar options to insert in markdown cells to: 
       horizontal green start; horizontal brown stop; left vertical 

setup.py

@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="jupyter-instructortools",
-    version="0.5.6",
+    version="0.5.6.1",
     description="Useful tools for instructors creating Jupyter notebook templates.",
     long_description=long_description,
     long_description_content_type="text/markdown",
@@ -19,7 +19,7 @@
     install_requires=[
         # 'python>=3.6',
         'jupyter>=1.0.0',
-        'notebook==6.4.0',
+        'notebook>=6.4.7',
         'jupyter-datainputtable>=0.7.5',
         'JPSLUtils',
         #'pandas>=0.22.0'