chore: add comment on cancel

Author: vasco-santos

src/handler.js

@@ -193,6 +193,7 @@ async function batchResponse ({ blocks, context, logger }) {
         telemetry.increaseLabelCount('bitswap-block-success-cancel', [block.type])
         telemetry.increaseLabelCount('bitswap-cancel-size', [block.type], size)
 
+        logger.info({ key: block.key }, 'delete')
         context.canceled.delete(block.key)
       } else {
         const size = messageSize[block.type](block)