Bump future from 0.15.2 to 0.18.3 in /scripts

Bumps [future](https://github.com/PythonCharmers/python-future) from 0.15.2 to 0.18.3.
- [Release notes](https://github.com/PythonCharmers/python-future/releases)
- [Changelog](https://github.com/PythonCharmers/python-future/blob/master/docs/changelog.rst)
- [Commits](PythonCharmers/python-future@v0.15.2...v0.18.3)

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

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

scripts/requirements.txt

@@ -10,7 +10,7 @@ click-plugins==1.0.3
 cligj==0.4.0
 cssselect==0.9.1
 distribute==0.7.3
-future==0.15.2
+future==0.18.3
 futures==3.0.5
 ftfy==4.2.0
 gevent==1.1.2