fix: update peer dependency for @rspack/core v2 (#61)

Author: chenjiahan

package.json

@@ -43,7 +43,7 @@
     "picocolors": "^1.1.1"
   },
   "peerDependencies": {
-    "@rspack/core": "^1.0.0",
+    "@rspack/core": "^1.0.0 || ^2.0.0-0",
     "typescript": ">=3.8.0"
   },
   "peerDependenciesMeta": {