Bump greenlet from 1.1.2 to 2.0.2 (#26)

Bumps [greenlet](https://github.com/python-greenlet/greenlet) from 1.1.2 to 2.0.2.
- [Changelog](https://github.com/python-greenlet/greenlet/blob/master/CHANGES.rst)
- [Commits](python-greenlet/greenlet@1.1.2...2.0.2)

---
updated-dependencies:
- dependency-name: greenlet
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -22,7 +22,7 @@ Flask-SimpleMDE==0.3.0
 Flask-SQLAlchemy==2.5.1
 Flask-WTF==0.14.3
 Frozen-Flask==0.15
-greenlet==1.1.2
+greenlet==2.0.2
 idna==3.3
 inflection==0.5.1
 itsdangerous==2.0.1