docs: add note about dropping Python 2 support (#239)

README.md

@@ -7,6 +7,11 @@
 
 A framework to generate UI based Splunk Add-ons. It includes UI, Rest handler, Modular input, Oauth, Alert action templates.
 
+> Note: after UCC 5.2 Python 2 specific libraries are not supported anymore.
+> This means if the add-on has `package/lib/py2/requirements.txt` they will 
+> not be installed while running `ucc-gen` command. Therefore modular inputs 
+> that are supposed to run on Python 2 will not be supported by UCC. 
+
 ## What is UCC?
 
 UCC stands for  Universal Configuration Console. It is a service for generating Splunk Add-ons which is easily customizable and flexible.
@@ -19,7 +24,7 @@ UCC provides basic UI template for creating Addon's UI. It is helpful to control
 
 ## UCC 5
 
-UCC5 has potentialy breaking changes to add-ons using hook extension in the UX. Previously such hooks were limited to un-optomized js files placed in the package.
+UCC 5 has potentially breaking changes to add-ons using hook extension in the UX. Previously such hooks were limited to un-optimized js files placed in the package.
 Add-ons may now package such extensions with webpack.
 
 ## Requirements

docs/overview.rst

@@ -3,6 +3,12 @@ Overview
 splunk-add-on-ucc-framework is a framework to generate UI based Splunk Add-ons.
 It includes UI, Rest handler, Modular input, Oauth, Alert action templates.
 
+.. note::
+    After UCC 5.2 Python 2 specific libraries are not supported anymore.
+    This means if the add-on has :code:`package/lib/py2/requirements.txt` they will
+    not be installed while running :code:`ucc-gen` command. Therefore modular inputs
+    that are supposed to run on Python 2 will not be supported by UCC.
+
 What is UCC?
 ------------
 UCC stands for Universal Configuration Console.