Update slack links

Author: froggleston

README.md

@@ -1,5 +1,5 @@
-[![Create a Slack Account with us](https://img.shields.io/badge/Create_Slack_Account-The_Carpentries-071159.svg)](https://swc-slack-invite.herokuapp.com/)
-[![Slack Status](https://img.shields.io/badge/Slack_Channel-dc--socsci--py-E01563.svg)](https://swcarpentry.slack.com/messages/C9WJEBW01)
+[![Create a Slack Account with us](https://img.shields.io/badge/Create_Slack_Account-The_Carpentries-071159.svg)](https://slack-invite.carpentries.org/)
+[![Slack Status](https://img.shields.io/badge/Slack_Channel-dc--socsci--py-E01563.svg)](https://carpentries.slack.com/messages/C9WJEBW01)
 
 # Data Carpentry Python Lesson with Social Science Data