Marked the URL encoding for block transfers task as done

README.md

@@ -62,7 +62,7 @@ Talks / presentations I gave about Daisy:
 * ✔ Make creating new blockchains from scratch possible without changing the code
 * Implement nicer error handling when replying to messages
 * Refactor db..., action... and blockchain... funcs into struct methods
-* Implement the "URL" encoding for block transfers: so the data in the JSON messages isn't block data, but an URL to the block data.
+* ✔ Implement the "URL" encoding for block transfers: so the data in the JSON messages isn't block data, but an URL to the block data.
 * Implement a Bloom filter for tables in SQL queries, to skip querying blocks which don't have the appropriate tables.
 * Implement stochastic guarded block importing: if there apparently is a new block in the network: ask a number of peers if they've seen it before importing it.