upgrade csstree to v3 (#91)

closes #89

package.json

@@ -32,7 +32,7 @@
     "vite-plugin-dts": "^4.0.0-beta.1"
   },
   "dependencies": {
-    "css-tree": "^2.3.1"
+    "css-tree": "^3.0.0"
   },
   "files": [
     "dist"

test/rules.test.js

@@ -129,12 +129,6 @@ test('no trailing newline on empty nested rule', () => {
 	assert.equal(actual, expected)
 })
 
-test('formats Raw rule prelude', () => {
-	let actual = format(`:lang("nl","de"),li:nth-child() {}`)
-	let expected = `:lang("nl","de"),li:nth-child() {}` // no formatting applied
-	assert.equal(actual, expected)
-})
-
 test('formats nested rules with selectors starting with', () => {
 	let actual = format(`
 		selector {

test/selectors.test.js

@@ -160,4 +160,12 @@ test('adds a space before attribute selector flags', () => {
 [title="foo" i] {}`
 	assert.is(actual, expected)
 })
+
+test('formats :lang correctly', () => {
+	let actual = format(`:lang("nl","de"),li:nth-child() {}`)
+	let expected = `:lang("nl","de"),
+li:nth-child() {}`
+	assert.equal(actual, expected)
+})
+
 test.run()