fix: typecheck condition

closes 233

Author: Kikobeats

scripts/postinstall.js

@@ -27,9 +27,7 @@ const getBinary = async url => {
     : {}
   let response = await fetch(url, headers)
 
-  if (
-    response.headers.get('content-type').includes('application/octet-stream')
-  ) {
+  if (!response.headers.get('content-type') !== 'application/octet-stream') {
     const payload = await response.json()
     if (!response.ok) throw new Error(JSON.stringify(payload, null, 2))
     response = await getLatest(payload)