Stable v1.0.0

What's Changed

• add tests.yml workflows file by @KunalSin9h in #1
• Update README.md by @KunalSin9h in #2
• ci will now run only when push to master branch by @KunalSin9h in #3
• remove codecoverage ci by @KunalSin9h in #4
• Update README.md by @KunalSin9h in #5
• add test for POST /subscribe by @KunalSin9h in #6
• chore(ci): update dependencies by @KunalSin9h in #7
• add domain modeling for input by @KunalSin9h in #9

New Contributors

• @KunalSin9h made their first contribution in #1

Full Changelog: https://github.com/KunalSin9h/newsletter/commits/v1.0.0