chore: add astro as peer dependency

Signed-off-by: Andres Correa Casablanca <[email protected]>

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@kindspells/astro-sri-csp",
-	"version": "0.3.0",
+	"version": "0.3.1",
 	"description": "An Astro plugin to compute and inject SRI hashes for script and style tags",
 	"private": false,
 	"type": "module",
@@ -10,7 +10,10 @@
 		"types": "./main.d.ts",
 		"default": "./main.mjs"
 	},
-	"files": ["main.d.ts", "main.mjs"],
+	"files": [
+		"main.d.ts",
+		"main.mjs"
+	],
 	"scripts": {
 		"format": "biome format --write .",
 		"lint": "pnpm run lint:biome && pnpm run lint:tsc",
@@ -31,6 +34,9 @@
 	],
 	"author": "KindSpells Labs S.L.",
 	"license": "MIT",
+	"peerDependencies": {
+		"astro": "^4.3.5"
+	},
 	"devDependencies": {
 		"@biomejs/biome": "^1.5.3",
 		"@types/node": "^20.11.17",