RPC: Add "Mining Goal" to "pools" command

README.RPC

@@ -454,6 +454,7 @@ API V3.3
 Modified API command:
  'addpool' - accept an additional argument to indicate mining goal by name
  'coin' - return multiple elements, when there are multiple mining goals defined
+ 'pools' - add 'Mining Goal'
 
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api.c

@@ -1934,6 +1934,7 @@ static void poolstatus(struct io_data *io_data, __maybe_unused SOCKETTYPE c, __m
 		root = api_add_string(root, "Status", status, false);
 		root = api_add_int(root, "Priority", &(pool->prio), false);
 		root = api_add_int(root, "Quota", &pool->quota, false);
+		root = api_add_string(root, "Mining Goal", pool->goal->name, false);
 		root = api_add_string(root, "Long Poll", lp, false);
 		root = api_add_uint(root, "Getworks", &(pool->getwork_requested), false);
 		root = api_add_int(root, "Accepted", &(pool->accepted), false);