Updated meta keywords

Author: AchalJ

block.json

@@ -3,7 +3,7 @@
 	"title": "Image Comparison",
 	"category": "widgets",
 	"description": "A block to let your visitors compare between two images. After, before, horizontal, and vertical comparison.",
-	"keywords": ["image", "before", "after"],
+	"keywords": ["image", "before", "after", "comparison"],
 	"textdomain": "ib-image-comparison",
 	"supports": {
 		"html": false