Set PURGE method to purgeRoute function

Author: Maypher

src/lib/utils/purge.ts

@@ -5,5 +5,7 @@ const purgePath = 'http://varnish'
 /**Purges the given path from the varnish cache*/
 export default async function purgeRoute(path: string) {
   if (path.startsWith('/')) throw new SyntaxError(`path "${path}" cannot be absolute.`)
-  await fetch(`${purgePath}/${path}`)
+  await fetch(`${purgePath}/${path}`, {
+    method: 'PURGE',
+  })
 }