[code_prettify, autopep8, 2to3] Updated yaml with 5.x compatibility

Author: jfbercher

src/jupyter_contrib_nbextensions/nbextensions/code_prettify/2to3.yaml

@@ -3,7 +3,7 @@ Name: 2to3 Converter
 Description: Converts python2 code in a notebook's code cell to python3 code
 Link: README_2to3.md
 Main: 2to3.js
-Compatibility: Jupyter (4.x)
+Compatibility: Jupyter 4.x, 5.x
 Parameters:
 
 - name: 2to3.add_toolbar_button

src/jupyter_contrib_nbextensions/nbextensions/code_prettify/autopep8.yaml

@@ -3,7 +3,7 @@ Name: Autopep8
 Description: Use kernel-specific code to reformat/prettify the contents of code cells
 Link: README_autopep8.md
 Main: autopep8.js
-Compatibility: Jupyter (4.x)
+Compatibility: Jupyter 4.x, 5.x
 Parameters:
 
 - name: autopep8.add_toolbar_button

src/jupyter_contrib_nbextensions/nbextensions/code_prettify/code_prettify.yaml

@@ -3,7 +3,7 @@ Name: Code prettify
 Description: Use kernel-specific code to reformat/prettify the contents of code cells
 Link: README_code_prettify.md
 Main: code_prettify.js
-Compatibility: Jupyter (4.x)
+Compatibility: Jupyter 4.x, 5.x
 Parameters:
 
 - name: code_prettify.add_toolbar_button