Update README

README.md

@@ -172,12 +172,14 @@ Example configuration with **default values** _(apart from template.html or temp
 const nextApiOgImageConfig = {
   // Values passing strategy
   strategy: 'query',
-  // 'Content-Type' HTTP header
-  contentType: 'image/png',
-  // Width of the image in pixels (default 1200)
-  width: 2048,
-  // Height of the image in pixels (default 630)
-  height: 1170,
+  // Response's 'Content-Type' HTTP header and browser screenshot type.
+  type: 'png',
+  // Screenshot's quality. WORKS ONLY IF 'type' IS SET TO 'jpeg'
+  quality: 90,
+  // Width of the image in pixels
+  width: 1200,
+  // Height of the image in pixels 
+  height: 630,
   // 'Cache-Control' HTTP header
   cacheControl: 'max-age 3600, must-revalidate',
   // NOTE: Options within 'dev' object works only when process.env.NODE_ENV === 'development'