v1.4.0

• Optimize service start up
• Add modified filter for multisig txs #63
• Use IsoDateTimeFilter for every datetime
• Update MultisigTx on new Confirmation (related to #63)
• Start erc20 indexing one day before creation of Safe (Safes founded with token might be affected)
• New endpoint to return creation info of Safes #65
• Make webhooks independent from address #68
• Fix 500 in filters using Ethereum addresses