Singpass AccessToken API

What's Changed

• #load-config: support functions added by @mavensingh in #1
• Merge pull request #1 from mavensingh/load-config by @mavensingh in #2
• Token by @mavensingh in #3
• Token by @mavensingh in #4

New Contributors

• @mavensingh made their first contribution in #1

Full Changelog: https://github.com/mavensingh/myinfo-connector-golang/commits/v1.0.0-stable