Merge pull request #74 from orochi-network/bug/add_unique_into_receiver

add unique to pg-init.sql in table receiver from orand

docker/node/pg-init.sql

@@ -36,7 +36,7 @@ create table public.receiver (
 	nonce int8 not null,
 	created_date timestamp not null default CURRENT_TIMESTAMP,
 	constraint index_name unique (name),
-	constraint unique_address_and_network (address, network),
+	constraint unique_address_and_network unique (address, network),
 	constraint receiver_pkey primary key (id),
 	constraint link_receiver_to_keyring foreign key (keyring_id) references public.keyring(id)
 );