Bump freezegun from 0.3.15 to 1.2.1

Bumps [freezegun](https://github.com/spulec/freezegun) from 0.3.15 to 1.2.1.
- [Release notes](https://github.com/spulec/freezegun/releases)
- [Changelog](https://github.com/spulec/freezegun/blob/master/CHANGELOG)
- [Commits](spulec/freezegun@0.3.15...1.2.1)

---
updated-dependencies:
- dependency-name: freezegun
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

setup.py

@@ -29,7 +29,7 @@ def find_version(*file_paths):
         "pytest-cov==3.0.0",
         "twine==2.0.0",
         "mock==4.0.3",
-        "freezegun==0.3.15"
+        "freezegun==1.2.1"
     ]
 }