Updated manifest.json description

Updated description.

Author: capfei

manifest.json

@@ -2,7 +2,7 @@
   "manifest_version": 3,
   "name": "LicenseDB Diff",
   "version": "0.0.4",
-  "description": "Compare selected text with ScanCode LicenseDB.",
+  "description": "Compares and diffs selected text using AboutCode's ScanCode LicenseDB license list.",
   "permissions": [
     "activeTab",
     "scripting",
@@ -38,3 +38,4 @@
 }
 
 
+