Use the newer decorator syntax

[ghost]

Description

Use the newer flask decorators

Fixes #40

Changes Include

• Refactor ⚒️ (code change that neither fixes a bug nor adds a feature)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[Bhupesh-V]

Thanks for your contribution @heppymxm 🧡
Don't forget to leave us a star ⭐ or tweet about your contribution!

[Bhupesh-V]

@all-contributors please add @heppymxm for code

[allcontributors]

@Bhupesh-V

I've put up a pull request to add @heppymxm! 🎉