Update ciso8601 requirement from <2,>=1.0.2 to >=1.0.2,<3 (#108)

Updates the requirements on [ciso8601](https://github.com/closeio/ciso8601) to permit the latest version.
- [Release notes](https://github.com/closeio/ciso8601/releases)
- [Changelog](https://github.com/closeio/ciso8601/blob/master/CHANGELOG.md)
- [Commits](closeio/ciso8601@v1.0.2...v2.3.1)

---
updated-dependencies:
- dependency-name: ciso8601
  dependency-type: direct:production
...

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

setup.py

@@ -22,7 +22,7 @@
     tests_require=["nose", "flake8"],
     install_requires=[
         "arrow>=0.4.2",
-        "ciso8601>=1.0.2,<2",
+        "ciso8601>=1.0.2,<3",
         "pytz>=2015.4",
         "elasticsearch>=7.0,<7.14",
     ],