Update README.md with minor typo

Author: srushti

README.md

@@ -74,7 +74,7 @@ Install the plugin with your favorite package manager. See the [Configuration](#
         file_types = { 'markdown', 'opencode_output' },
       },
       ft = { 'markdown', 'Avante', 'copilot-chat', 'opencode_output' },
-    }
+    },
     -- Optional, for file mentions and commands completion, pick only one
     'saghen/blink.cmp',
     -- 'hrsh7th/nvim-cmp',