Bumped the core version to v0.19.5, and added the Python 3 badge.

Author: pscadding

README.md

@@ -1,3 +1,4 @@
+[![Python 2.6 2.7 3.7](https://img.shields.io/badge/python-2.6%20%7C%202.7%20%7C%203.7-blue.svg)](https://www.python.org/)
 [![Build Status](https://dev.azure.com/shotgun-ecosystem/Toolkit/_apis/build/status/Apps/tk-multi-reviewsubmission?branchName=master)](https://dev.azure.com/shotgun-ecosystem/Toolkit/_build/latest?definitionId=64&branchName=master)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Linting](https://img.shields.io/badge/PEP8%20by-Hound%20CI-a873d1.svg)](https://houndci.com)

info.yml

@@ -102,7 +102,7 @@ description: "Provides functionality to submit media to Shotgun for review."
 
 # Required minimum versions for this item to run
 requires_shotgun_version:
-requires_core_version: "v0.14.0"
+requires_core_version: "v0.19.5"
 requires_engine_version:
 
 supported_engines: