Add release notes for v1.2.3

notes/v1.2.3.md

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+# bloop `v1.2.3` :surfer:
+
+## Upgrade guide :electric_plug:
+
+This section describes the upgrade steps. If you don't have bloop installed, please read
+the [installation instructions][] instead.
+
+If you're on macOS, **upgrade** to the latest version with:
+
+```sh
+$ brew upgrade scalacenter/bloop/bloop
+$ brew services restart bloop
+```
+
+If you're on Windows using `scoop`, **upgrade** to the latest version with:
+
+```sh
+$ scoop upgrade bloop
+$ bloop ng-stop
+$ // Start the server as you usually do (via systemd, manually, desktop services)
+```
+
+Otherwise, run:
+
+```
+$ curl -L https://github.com/scalacenter/bloop/releases/download/v1.2.3/install.py | python
+$ bloop ng-stop
+$ // Start the server as you usually do (via systemd, manually, desktop services)
+```
+
+Read the complete installation instructions in our [Installation page][installation instructions].
+
+## Highlights :books:
+
+`v1.2.3` is only a bugfix release.
+
+### Don't fail installation when Python 3 is used and http_proxy is defined
+
+See https://github.com/scalacenter/homebrew-bloop/issues/4 for more details.
+
+### Disable failed process logs in launcher ([#798](https://github.com/scalacenter/bloop/pull/798))
+
+This change clears up the logs of the launcher when processes are run and
+they fail. See the linked pull request for more details.
+
+## Contributors :busts_in_silhouette:
+
+According to `git shortlog -sn --no-merges v1.2.2..v1.2.2`, 2 people contributed to this `v1.2.2`
+release: Jorge Vicente Cantero, marek1840.
+
+[installation instructions]: https://scalacenter.github.io/bloop/setup