Bump furl from 2.0.0 to 2.1.0 in /requirements

Bumps [furl](https://github.com/gruns/furl) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/gruns/furl/releases)
- [Changelog](https://github.com/gruns/furl/blob/master/changelog.txt)
- [Commits](https://github.com/gruns/furl/compare/v2.0.0...v2.1.0)

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

requirements/common.txt

@@ -346,9 +346,9 @@ ecdsa==0.13.2 \
 future==0.17.1 \
     --hash=sha256:67045236dcfd6816dc439556d009594abf643e5eb48992e36beac09c2ca659b8
 
-furl==2.0.0 \
-    --hash=sha256:f7e90e9f85ef3f2e64485f04c2a80b50af6133942812fd87a44d45305b079018 \
-    --hash=sha256:fdcaedc1fb19a63d7d875b0105b0a5b496dd0989330d454a42bcb401fa5454ec
+furl==2.1.0 \
+    --hash=sha256:f4d6f1e5479c376a5b7bdc62795d736d8c1b2a754f366a2ad2816e46e946e22e \
+    --hash=sha256:c0e0231a1feee2acd256574b7033df3144775451c610cb587060d6a0d7e0b621
 orderedmultidict==1.0.1 \
     --hash=sha256:43c839a17ee3cdd62234c47deca1a8508a3f2ca1d0678a3bf791c87cf84adbf3 \
     --hash=sha256:04070bbb5e87291cc9bfa51df413677faf2141c73c61d2a5f7b26bea3cd882ad