chores: add v0.3.0-rc5 release notes

docs/release-notes/RELEASE-v0.3.0-rc5.md

@@ -0,0 +1,42 @@
+Kapow! v0.3.0
+
+## Features
+
+* Feature parity with the original PoC (written in Python), with some exceptions
+  explained in the next section.
+
+* Built and tested against Go 1.13.5.
+
+* (Almost) no bytes were harmed during the development of this release.
+
+
+## Known issues and limitations
+
+### User server
+
+* [#76][i76] Only plain `http` is supported for now, since `https` support is
+  not yet complete. The `kapow server` flags `--certfile` and `--keyfile` are
+  present but non-functional yet.
+
+
+### Data API
+
+* [#73][i73] `/response/body` and `/response/stream` behave identically for now.
+
+* [#92][i92] `KAPOW_DATA_URL` is always set to its default value of
+  `http://localhost:8082`, and not to the actual value, as specified by the
+  `kapow server --data-bind "host:port"` invocation.
+
+
+### Windows®
+
+* [#83][i83] `kapow server file.pow` will try to run `file.pow` through `bash`, not `cmd`
+  or `powershell`.
+* `kapow route` default entrypoint is `/bin/sh`, so in order to use `cmd` or
+  `powershell`, it must be explicitly set.
+
+
+[i73]: https://github.com/BBVA/kapow/issues/73
+[i76]: https://github.com/BBVA/kapow/issues/76
+[i83]: https://github.com/BBVA/kapow/issues/83
+[i92]: https://github.com/BBVA/kapow/issues/92