Update all.json (#136)

Added newly created domain names polkadot-airdrop.online and polkadot-airdrops.net as submitted by Polkadot discord member bugra.ayan

all.json

@@ -14,7 +14,9 @@
     "polkabeam.org",
     "polkadot-airdrop.info",
     "polkadot-airdrop.live",
+    "polkadot-airdrop.online",
     "polkadot-airdrop.org",
+    "polkadot-airdrops.net",
     "polkadot-bonus.network",
     "polkadot-dot.info",
     "polkadot-event.com",