update README to reflect update from Python 3.6.10 to 3.7.6

Author: Mike Holloway

README.md

@@ -4,7 +4,7 @@ Docker image for [Errbot](http://errbot.io), a chat-bot designed to be easily de
 
 [https://hub.docker.com/r/swarmstack/errbot-docker/](https://hub.docker.com/r/swarmstack/errbot-docker/)
 
-Built from Alpine Linux 3.11 / Python 3.6(.10). Functions as a vanilla Errbot with it's available backends, plus optional Cisco Webex Teams backend support. Support for other community-provided backends.  Plugins can be installed and configured via the bot. [swarmstack](https://github.com/swarmstack/swarmstack) users should begin at the SWARMSTACK USERS section.
+Built from Alpine Linux 3.11 / Python 3.7.6 - Functions as a vanilla Errbot with it's available backends, plus optional Cisco Webex Teams backend support. Support for other community-provided backends.  Plugins can be installed and configured via the bot. [swarmstack](https://github.com/swarmstack/swarmstack) users should begin at the SWARMSTACK USERS section.
 
 The documentation below focuses on installing Errbot for use as a webhook receiver for Prometheus Alertmanager and adding Prometheus ChatOps to the bot, but the image is generally useful as a working Errbot with support for installing other Errbot plugins and backends.