Prepare release for 6.0.0

Author: smikitky

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## v6.0.0
+
+- Dropped support for CJS modules. This package is now ESM-only.
+- Migrated the test framework from Jest to Node's Test Runner.
+- Set the tests to run only on Node 20, 22, and 24. However, this package is expected to function in any JS environment as long as ESM is supported; if it does not, please file an issue.
+
 ## v5.2.0
 
 - Added `individualThreshold` option to `stringify()`.
@@ -27,7 +33,6 @@ The API has changed radically in version 5. The new API is slightly more verbose
 - Dropped support for IE and old Node.
 - Migrated to pure function-style API and added an ESM build. This package is now fully tree-shakable.
 - In addition to the change from methods to simple functions, some functions have also been renamed or removed.
-
   - (constructor): Use `parse()` or `normalize()`.
   - `toArray`: Renamed to `flatten()`.
   - `toString`: Renamed to `stringify()`.
@@ -114,7 +119,6 @@ The API has changed radically in version 5. The new API is slightly more verbose
 **❗️ Breaking Changes**
 
 - Removed the following methods which had been deprecated since v2.0.0.
-
   - `isContinuous()` (Gone for good. Use `segmentLength() === 1` instead)
   - `hasRange()` \*
   - `appendRange()` \*

README.md

@@ -31,7 +31,7 @@ Install via npm or yarn:
 npm install multi-integer-range
 ```
 
-Version 5 is a hybrid package; it provides both a CommonJS version and an ES Module version, built from the same TypeScript source. Bundlers such as Webpack can automatically pick the ESM version and perform tree-shaking. This package has no external dependencies nor does it use any Node-specific API.
+Version 6 is a fully tree-shakable, ESM-only package. This package has no external dependencies nor does it use any Node-specific API.
 
 🚨 The API style has changed drastically in version 5. The new API is slightly more verbose, but is simpler and tree-shakable 🌲. For example, if you don't use the default parser, your bundle will not include it. See the [CHANGELOG](./CHANGELOG.md) and the [docs for version 4](https://github.com/smikitky/node-multi-integer-range/tree/v4.0.9).