Updated readme to include unicode chars (#144)

* Updated readme to include unicode chars

Change:
- Updated readme to include unicode chars for the checkmark. 
- Removed V2 from supported versions

* Adding pdthummar to CODEOWNERS

Co-authored-by: Varad Meru <vrdmr@users.noreply.github.com>

Author: gavin-aguiar

CODEOWNERS

@@ -9,4 +9,4 @@
 # AZURE FUNCTIONS TEAM
 # For all file changes, github would automatically include the following people in the PRs.
 #
-* @vrdmr @gavin-aguiar @YunchuWang
+* @vrdmr @gavin-aguiar @YunchuWang @pdthummar

README.md

@@ -16,9 +16,8 @@ _What are the supported Python versions?_
 
 | Azure Functions Runtime | Python 3.6 | Python 3.7 | Python 3.8 | Python 3.9 |
 |-------------------------|------------|------------|------------|------------|
-| Azure Functions 2.0     | ✔          | ✔          | -          | -          |
-| Azure Functions 3.0     | ✔          | ✔          | ✔          | ✔          |
-| Azure Functions 4.0     | -          | ✔          | ✔          | ✔          |
+| Azure Functions 3.0     | ✓          | ✓          | ✓          | ✓          |
+| Azure Functions 4.0     | ✓          | ✓          | ✓          | ✓          |
 
 _What's available?_
 - Build, test, debug and publish using Azure Functions Core Tools (CLI) or Visual Studio Code