Use latest univers branch

This adds univer from the current branch that support "vers".
See aboutcode-org/univers#12

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

requirements.txt

@@ -9,7 +9,8 @@ drf-spectacular>=0.17.1
 packageurl-python>=0.9.4
 binaryornot>=0.4.4
 GitPython>=3.1.17
-univers>=21.4.16.6
+#univers>=21.4.16.6
+git+https://github.com/nexB/univers@adopt-vers-spec#univers
 saneyaml>=0.5.2
 beautifulsoup4>=4.9.3
 python-dateutil>=2.8.1