Replace personal email with PMC mailing list address (#253)

.goreleaser.yml

@@ -42,7 +42,7 @@ snapshot:
 nfpms:
   - homepage: https://kopia.io
     vendor: Kopia Project
-    maintainer: Jarek Kowalski <jaak@jkowalski.net>
+    maintainer: Kopia Project <kopia-pmc@googlegroups.com>
     description: Fast and secure open source backup.
     license: Apache 2.0
     formats:

README.md

@@ -45,7 +45,7 @@ Kopia is open source and contributions are welcome. For more information on how
 
 Reporting Security Issues
 ---
-If you find a security issue you'd like to disclose privately, please contact `jaak@jkowalski.net` or via direct message on [Slack](https://slack.kopia.io).
+If you find a security issue you'd like to disclose privately, please contact `kopia-pmc@googlegroups.com` or via direct message to maintainers on [Slack](https://slack.kopia.io).
 
 
 Disclaimer

site/content/docs/Contribution guidelines/_index.md

@@ -16,7 +16,7 @@ weight: 100
 
 ## Security issues
 
-* If you find a security issue that you want to disclose privately, please contact `jaak@jkowalski.net` or send a direct message on Slack.
+* If you find a security issue that you want to disclose privately, please contact `kopia-pmc@googlegroups.com` or send a direct message on Slack.
 
 ## Submitting code via Pull Requests