Update changelog

CHANGELOG.md

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 # Bulma Changelog
 
+## 1.0.1
+
+### Bug fixes
+
+- Fix #3755: `.select` colors
+- 
+### Documentation fixes
+
+- Fix #3725
+- Fix #3720
+- Update online documentation link in README
+- Update `migrating-to-v1.html`
+- Fix #3735
+- Fix #3729: explain how to use Bulma in a modular way
+- Fix #3785: make use of the `@prefers-reduced-motion` setting
+
+### Improvements
+
+- Fix #3737: Move `sass` to `devDependencies`
+
+## 1.0.0
+
+Bulma v1 is a **full rewrite** of the framework using [**Dart Sass**](https://sass-lang.com/dart-sass/), which is the the primary implementation of Sass. While this affects a few development details, everything has been done to make the transition **as easy as possible**.
+
+## What remains the same
+
+**All HTML snippets are the same**. This means you don't need to update your markup. **This is important** because it means, if you're using Bulma straight "out of the box", you don't need to change anything.
+
+You can just swap `bulma@0.9.4/css/bulma.min.css` with `bulma@1.0.0/css/bulma.min.css` and everything will work. Things will look slightly different, but they will still work.
+
+## What changes
+
+* [**Dart Sass**](https://sass-lang.com/dart-sass/) is used to build Bulma
+  * if you use the `sass` npm package, you're already using Dart Sass
+* [**CSS Variables**](https://bulma.io/documentation/features/css-variables/) are used instead of literals: `color: var(--bulma-primary);` instead of `color: hsl(171deg, 100%, 41%);`, which means you can customize Bulma with CSS only (without using Sass)
+* Customization by setting your own value for Sass variables works differently. See [how to customize Bulma with Sass](https://bulma.io/documentation/customize/).
+
+## What's new (i.e. did not exist before)
+
+* The notion of [**Themes**](https://bulma.io/documentation/features/themes/) is introduced: a theme is a collection of CSS variables within a context, and is the best approach to customize Bulma
+* As a result, a Theme for [**Dark Mode**](https://bulma.io/documentation/features/dark-mode/) is included
+* [**Color Palettes**](https://bulma.io/documentation/features/color-palettes/) are created for each of the 7 primary colors
+* [**Skeleton loaders**](https://bulma.io/documentation/features/skeletons/) exist as standalone components but also as variants of other components
+* You can add a **prefix** to all your Bulma classes so that `.button` becomes `.my-prefix-button`
+  * a pre-built prefixed version exists as one of the [**alternative versions**](https://bulma.io/documentation/start/alternative-versions/)
+
 ## 0.9.4
 
 ### New features