Fix warning when only using lqip loader

Author: cyrilwanner

lib/loaders/index.js

@@ -93,7 +93,11 @@ const getHandledImageTypes = (nextConfig) => {
  * @returns {number}
  */
 const getNumOptimizationLoadersInstalled = loaders => Object.values(loaders)
-  .filter(loader => loader && (loader.startsWith('imagemin-') || loader.startsWith('webp-'))).length;
+  .filter(loader => loader && (
+    loader.startsWith('imagemin-')
+    || loader.startsWith('webp-')
+    || loader.startsWith('lqip-')
+  )).length;
 
 /**
  * Appends all loaders to the webpack configuration