Add release notes for v0.4.1

docs/releases/v0.4.1.md

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+## v0.4.1
+
+The first patch release for the `v0.4.x` release stream.
+If you want to go and look at the new and changed stuff in v0.4.0, see [here](https://github.com/weaveworks/ignite/blob/master/CHANGELOG.md#v040).
+
+This release, we had an **amazing** amount of 9 PRs from 6 community contributors, in 48 hours after launch :tada:!
+We hope to see this trend continue, all help is very welcome to this community-driven project!
+
+### New Features / UX Improvements
+
+ - It is now possible to access and talk to the Firecracker socket, and metrics/logs FIFOs. (https://github.com/weaveworks/ignite/pull/132, https://github.com/patrobinson)
+ - Verify that the VM _actually_ did start before `ignite start/run` reports success (https://github.com/weaveworks/ignite/pull/139, https://github.com/twelho)
+ - Provide better UX and error messages for the `ignite ssh` command (https://github.com/weaveworks/ignite/pull/149, https://github.com/twelho)
+
+
+### Bugfixes
+
+ - Set the `-F` flag to `mkfs.ext4`, as it is required on RHEL platforms. (https://github.com/weaveworks/ignite/pull/131, https://github.com/junaid18183)
+ - Generate RSA keys instead of ED25519 on FIPS machines. (https://github.com/weaveworks/ignite/pull/136, https://github.com/junaid18183)
+ - Make the filtering framework respect exact matches (https://github.com/weaveworks/ignite/pull/138, https://github.com/twelho)
+ - Don't fail although there are inactive network interfaces in the container (https://github.com/weaveworks/ignite/pull/146, https://github.com/luxas)
+
+
+### Docs improvements
+
+ - Add a next action link for better developer-workflow in `installation.md` (https://github.com/weaveworks/ignite/pull/118, https://github.com/alexellis)
+ - Error out if the Ignite binary download fails (https://github.com/weaveworks/ignite/pull/120, https://github.com/alexellis)
+ - Improve wording in the `README.md` (https://github.com/weaveworks/ignite/pull/125, https://github.com/seeekr)
+ - Fix link to the `prometheus.md` doc (https://github.com/weaveworks/ignite/pull/126, https://github.com/webwurst)
+ - Fix typo in `docs/README.md` (https://github.com/weaveworks/ignite/pull/128, https://github.com/andrelop)
+ - Added demo video to docs/usage.md (https://github.com/weaveworks/ignite/pull/140, https://github.com/paavan98pm)
+ - Add docs on how to check for KVM support in the CPU/kernel (https://github.com/weaveworks/ignite/pull/145, https://github.com/luxas)
+
+
+## Trying it out / Next Steps!
+
+In short:
+
+```bash
+export VERSION=v0.4.1
+curl -fLo ignite https://github.com/weaveworks/ignite/releases/download/${VERSION}/ignite
+chmod +x ignite
+sudo mv ignite /usr/local/bin
+```
+
+A more throughout installation guide is available here: https://github.com/weaveworks/ignite/blob/master/docs/installation.md