Update Slack information in MAINTAINERS file
The maintainers are generally available in Slack at
-https://weave-community.slack.com/messages/flux/ (obtain an invitation
-at https://slack.weave.works/).
+https://cloud-native.slack.com in #flux (https://cloud-native.slack.com/messages/CLAJ40HV3)
+(obtain an invitation at https://slack.cncf.io/).
In alphabetical order:
Alfonso Acosta, Weaveworks <fons@weave.works> (github: @2opremio, slack: fons)
Hidde Beydals, Weaveworks <hidde@weave.works> (github: @hiddeco, slack: hidde)
-Justin Barrick, independent <justin.m.barrick@gmail.com> (github: @justinbarrick, slack: Justin Barrick)
-Michael Bridgen, Weaveworks <michael@weave.works> (github: @squaremo, slack: mbridgen)
-Nick Cabatoff, independent <nick.cabatoff@gmail.com> (github: @ncabatoff, slack: Nick Cabatoff)
-Stefan Prodan, Weaveworks <stefan@weave.works> (github: @stefanprodan, slack: stefan)
+Justin Barrick, independent <justin.m.barrick@gmail.com> (github: @justinbarrick)
+Michael Bridgen, Weaveworks <michael@weave.works> (github: @squaremo, slack: Michael Bridgen)
+Nick Cabatoff, independent <nick.cabatoff@gmail.com> (github: @ncabatoff)
+Stefan Prodan, Weaveworks <stefan@weave.works> (github: @stefanprodan, slack: stefanprodan)
