Add a really basic changelog (#10)

Author: Cameron Lamb

CHANGELOG.md

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+# Wagtail Footnotes Changelog
+
+## Unreleased
+
+- Add `WAGTAIL_FOOTNOTES_TEXT_FEATURES` to add custom rich text features to footnote content
+
+## 0.5.0
+
+- Update requirements to `wagtail>=2.5, <3`
+- Fix Javascript registering
+
+## 0.4.0
+
+- Replace tags in both `render` and `render_basic`
+
+## 0.3.1
+
+- Cleanup code/readme
+- Increase requirements to `Django>=2.2, <3.2` and `wagtail>=2.5, <2.11`
+
+## 0.3.0
+
+- Remove old template tag references
+- Remove the `FootnotesMixin`
+- Mark output of `RichTextBlockWithFootnotes` as safe
+
+## 0.2.0
+
+- Moved templates to `wagtail_footnotes/templates/wagtail_footnotes/*`
+
+## 0.1.0
+
+- Initial release of the Wagtail Footnotes package