RPC Batching + Connect with Request

What's Changed

• Fix typo in readme by @alexandratran in #105
• RPC chaining by @elefantel in #109
• feature: Connect with request by @elefantel in #113
• feature: Dapp icon support by @elefantel in #114
• Update README with connect with examples by @elefantel in #115
• Update sdk ios and swift versions requirements by @elefantel in #116

Full Changelog: 0.3.1...0.4.0