mobpay 0.2.0

This package is meant to aid in integrating to Interswitch IPG for the following services

[0.0.1] - TODO: Add release date.

• TODO: Describe initial release.

[0.0.3] - Added live links

• Added the links to for the go live procedure

[0.0.4] - Error Handling in mobile

• Error handling done for mobile transactions

[0.0.5] - Added primary accent color

• Added primary accent color in the config object
• removed will topic
• Updated mqtt_client to version 9.3
• Changed to named parameters

[0.0.6] - MQTT stability fixes

• Better error handling
• Introduced keep alive in mqtt

[0.1.0] - Stability Fixes

• Introduced the context parameter in the pay function
• Moved from url to webkit
• Other bug fixes
• Enabled a user to exit by pressing on return to app on the web browser

[0.2.0] - Dependency upgrade

• Upgraded retrofit_generator
• Upgraded build_runner
• Upgraded json_serializable
• Upgraded retrofit