add arbitrum testnet contract (#76)

* add arbitrum testnet contract

* remove unnecessary changes

Author: cctdaniel

pyth-evm-js/src/index.ts

@@ -31,4 +31,5 @@ export const CONTRACT_ADDR: Record<string, string> = {
   kcc_testnet: "0x15D35b8985e350f783fe3d95401401E194ff1E6f",
   cronos: "0xE0d0e68297772Dd5a1f1D99897c581E2082dbA5B",
   cronos_testnet: "0xBAEA4A1A2Eaa4E9bb78f2303C213Da152933170E",
+  arbitrum_goerli: "0x939C0e902FF5B3F7BA666Cc8F6aC75EE76d3f900",
 };