Adds new APIs with major refactor

What's Changed

• Add C2B URL registration by @weezqyd in #25
• Refactor: remove identifiers by @jwambugu in #26
• Refactor tests - use shared context by @jwambugu in #28
• Add dynamic qr api #29 by @jwambugu in #38
• Add constants for different parameters by @jwambugu in #39
• Add Transaction Status API #30 by @jwambugu in #40
• Add Account Balance API by @jwambugu in #41
• Update README.md by @jwambugu in #44
• Use uber style guide and housekeeping #42 by @jwambugu in #43
• Refactor endpoints by @jwambugu in #46
• Add business pay bill by @jwambugu in #47
• Update docs and extract constant types by @jwambugu in #48

New Contributors

• @weezqyd made their first contribution in #25

Full Changelog: v1.0.7...v1.0.8

Refactor api response and tests

What's Changed

• Refactor api response by @jwambugu in #23
• Use GeneralRequestResponse instead of STKPushRequestResponse, B2CRequestResponse
• Rename STKPushQuery to STKQuery
• Rename STKPushQueryRequest to STKQueryRequest

Full Changelog: v1.0.6...v1.0.7

Add M-Pesa Express Query API

What's Changed

• Add STK query API by @jwambugu in #20

Full Changelog: v1.0.5...v1.0.6

Refactor and add Tests APIs

What's Changed

• Testing by @jwambugu in #10
• Testing by @jwambugu in #11
• Testing by @jwambugu in #12
• Refactor request to generate access token and main app by @jwambugu in #13
• Refactor STK push request by @jwambugu in #14
• Set up linting and testing actions by @jwambugu in #15
• Add helper function for unmarshalling STKPushCallback by @jwambugu in #16
• Refactor B2C API and update tests by @jwambugu in #17
• Unmarshal B2CCallback and refactor structs by @jwambugu in #18
• Update readme and refactor by @jwambugu in #19

Full Changelog: v1.0.4...v1.0.5