Reorders version summaries in README.

Author: jakubpawlowicz

README.md

@@ -20,10 +20,10 @@ Previously a part of clean-css it's a separate package since clean-css 4.0.
 - [Install](#install)
 - [Use](#use)
   * [What's new in version 5.0](#whats-new-in-version-50)
-  * [Important: 4.0 breaking changes](#important-40-breaking-changes)
-  * [What's new in version 4.1](#whats-new-in-version-41)
-  * [What's new in version 4.2](#whats-new-in-version-42)
   * [What's new in version 4.3](#whats-new-in-version-43)
+  * [What's new in version 4.2](#whats-new-in-version-42)
+  * [What's new in version 4.1](#whats-new-in-version-41)
+  * [What's new in version 4.0](#whats-new-in-version-40)
   * [CLI options](#cli-options)
   * [Compatibility modes](#compatibility-modes)
   * [Formatting options](#formatting-options)
@@ -71,23 +71,17 @@ clean-css-cli 5.0 introduces the following changes / features:
 * `--skip-rebase` option has been removed as rebasing URLs is disabled by default now
 * `--with-rebase` option is added if you really want URLs rebasing
 
-## Important: 4.0 breaking changes
+## What's new in version 4.3
 
-clean-css-cli 4.0 introduces some breaking changes:
+clean-css-cli 4.3 introduces the following changes / features:
 
-* API and CLI interfaces are split, so CLI has been moved to this repository while API stays at [clean-css](https://github.com/jakubpawlowicz/clean-css);
-* `--root` and `--relativeTo` options are replaced by a single option taken from `--output` path - this means that rebasing URLs and import inlining is much simpler but may not be (YMMV) as powerful as in 3.x;
-* `--rounding-precision` is disabled by default;
-* `--rounding-precision` applies to **all** units now, not only `px` as in 3.x;
-* `--skip-import` and `--skip-import-from` are merged into `--inline` option which defaults to `local`. Remote `@import` rules are **NOT** inlined by default anymore;
-* renames `--timeout` option to `--inline-timeout`;
-* remote resources without a protocol, e.g. `//fonts.googleapis.com/css?family=Domine:700`, are not inlined anymore;
-* changes default Internet Explorer compatibility from 9+ to 10+, to revert the old default use `--compatibility ie9` option;
-* moves `--rounding-precision`, `--s0`, and `--s1` options to level 1 optimization options, see examples;
-* moves `--skip-media-merging`, `--skip-restructuring`, `--semantic-merging`, and `--skip-shorthand-compacting` to level 2 optimizations options, see examples below;
-* level 1 optimizations are the new default, up to 3.x it was level 2;
-* `--keep-breaks` option is replaced with `--format keep-breaks` to ease transition;
-* `--skip-aggressive-merging` option is removed as aggressive merging is replaced by smarter override merging.
+* `--input-source-map` option which accepts a path to input source map file.
+
+## What's new in version 4.2
+
+clean-css-cli 4.2 introduces the following changes / features:
+
+* [clean-css 4.2](https://github.com/jakubpawlowicz/clean-css#whats-new-in-version-42) as a dependency;
 
 ## What's new in version 4.1
 
@@ -100,17 +94,23 @@ clean-css-cli 4.1 introduces the following changes / features:
 * extracts CLI into an importable module, so it can be reused and enhanced if needed;
 * adds `beforeMinify` callback as a second argument to CLI module, see [example use case](#as-a-module).
 
-## What's new in version 4.2
-
-clean-css-cli 4.2 introduces the following changes / features:
-
-* [clean-css 4.2](https://github.com/jakubpawlowicz/clean-css#whats-new-in-version-42) as a dependency;
+## What's new in version 4.0
 
-## What's new in version 4.3
-
-clean-css-cli 4.3 introduces the following changes / features:
+clean-css-cli 4.0 introduces some breaking changes:
 
-* `--input-source-map` option which accepts a path to input source map file.
+* API and CLI interfaces are split, so CLI has been moved to this repository while API stays at [clean-css](https://github.com/jakubpawlowicz/clean-css);
+* `--root` and `--relativeTo` options are replaced by a single option taken from `--output` path - this means that rebasing URLs and import inlining is much simpler but may not be (YMMV) as powerful as in 3.x;
+* `--rounding-precision` is disabled by default;
+* `--rounding-precision` applies to **all** units now, not only `px` as in 3.x;
+* `--skip-import` and `--skip-import-from` are merged into `--inline` option which defaults to `local`. Remote `@import` rules are **NOT** inlined by default anymore;
+* renames `--timeout` option to `--inline-timeout`;
+* remote resources without a protocol, e.g. `//fonts.googleapis.com/css?family=Domine:700`, are not inlined anymore;
+* changes default Internet Explorer compatibility from 9+ to 10+, to revert the old default use `--compatibility ie9` option;
+* moves `--rounding-precision`, `--s0`, and `--s1` options to level 1 optimization options, see examples;
+* moves `--skip-media-merging`, `--skip-restructuring`, `--semantic-merging`, and `--skip-shorthand-compacting` to level 2 optimizations options, see examples below;
+* level 1 optimizations are the new default, up to 3.x it was level 2;
+* `--keep-breaks` option is replaced with `--format keep-breaks` to ease transition;
+* `--skip-aggressive-merging` option is removed as aggressive merging is replaced by smarter override merging.
 
 ## CLI options