Merge pull request #1944 from tgodzik/release-notes-1.5.6

chore: Add release notes for 1.5.6

notes/v1.5.6.md

@@ -0,0 +1,22 @@
+# bloop `v1.5.6`
+
+Bloop v1.5.6 is a bugfix release to release a new image working on older linux
+systems.
+
+## Installing Bloop
+
+For more details about installing Bloop, please see
+[Bloop's Installation Guide](https://scalacenter.github.io/bloop/setup))
+
+## Merged pull requests
+
+Here's a list of pull requests that were merged:
+
+- Chore: downgrade release ubuntu version [#1943]
+
+[#1943]: https://github.com/scalacenter/bloop/pull/1943
+
+## Contributors
+
+According to `git shortlog -sn --no-merges v1.5.5..v1.5.6`, the following people
+have contributed to this `v1.5.6` release: Tomasz Godzik.