fix(deps): update simplejson requirement from ==3.17.* to >=3.17,<3.19

Updates the requirements on [simplejson](https://github.com/simplejson/simplejson) to permit the latest version.
- [Release notes](https://github.com/simplejson/simplejson/releases)
- [Changelog](https://github.com/simplejson/simplejson/blob/master/CHANGES.txt)
- [Commits](simplejson/simplejson@v3.17.0...v3.18.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

setup.py

@@ -45,7 +45,7 @@
 
         #: flask uses this by default if installed
         #: this handles decimals as returned from open sgid data better than the default json library
-        'simplejson==3.17.*',
+        'simplejson>=3.17,<3.19',
     ],
     extras_require={
         'tests': [