FlowSDK v0.4.2

FlowSDK v0.4.2

What's Changed

• test: sync ffi and rust MqttTlsOptionsC by @qzhuyan in #81
• ci: enhance coverage reporting and add integration coverage script by @qzhuyan in #82
• rel: 0.4.2 by @qzhuyan in #83

Full Changelog: 0.4.1...v0.4.2