Bump future from 0.18.2 to 0.18.3 (#1970)

* Bump future from 0.18.2 to 0.18.3

Bumps [future](https://github.com/PythonCharmers/python-future) from 0.18.2 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](https://github.com/PythonCharmers/python-future/compare/v0.18.2...v0.18.3)

---
updated-dependencies:
- dependency-name: future
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

* Update future==0.18.3

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>

[skip ci]

lib/past/types/basestring.py

@@ -25,9 +25,8 @@ class BaseBaseString(type):
     def __instancecheck__(cls, instance):
         return isinstance(instance, (bytes, str))
 
-    def __subclasshook__(cls, thing):
-        # TODO: What should go here?
-        raise NotImplemented
+    def __subclasscheck__(cls, subclass):
+        return super(BaseBaseString, cls).__subclasscheck__(subclass) or issubclass(subclass, (bytes, str))
 
 
 class basestring(with_metaclass(BaseBaseString)):

lib/past/types/oldstr.py

@@ -20,7 +20,7 @@ class BaseOldStr(type):
 
 
 def unescape(s):
-    """
+    r"""
     Interprets strings with escape sequences
 
     Example: