Add v0.8.1 release notes

Co-authored-by: İnanç Gümüş <inanc.gumus@grafana.com>
Co-authored-by: Ankur Agarwal <ankur.agarwal@grafana.com>

Author: 3 people

release notes/v0.8.1.md

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+This is a patch release that fixes a few bugs, including one [regression bug](https://github.com/grafana/xk6-browser/issues/749) introduced in v0.8.0, adds one improvement on documentation, and does minor internal modifications.
+
+
+## Bugs fixed
+
+- Fix mapping of `Page`'s `Keyboard`, `Mouse`, and `Touchscreen` properties. ([#751](https://github.com/grafana/xk6-browser/pull/751))
+- Fix `Page.URL()` method. ([#758](https://github.com/grafana/xk6-browser/pull/758))
+- Fix `Frame.Title()` method. ([#761](https://github.com/grafana/xk6-browser/pull/761))
+
+
+## Improvements
+
+- Added contributing guidelines. ([#750](https://github.com/grafana/xk6-browser/pull/750))
+
+
+## Internals
+
+- Reverted version bump for some dependencies in order to match k6 versions. ([#743](https://github.com/grafana/xk6-browser/pull/743))
+- Fix usage of stale virtual user context in mapping layer. ([#754](https://github.com/grafana/xk6-browser/pull/754))
+- Removed the unused browser closing state. ([#759](https://github.com/grafana/xk6-browser/pull/759))