Don't require pbr on runtime

hroncok · stephenfin · commit 04477b82467b · 2021-02-24T16:52:00.000Z
It is only used to build this package.
diff --git a/requirements.txt b/requirements.txt
@@ -1,4 +1,3 @@
-pbr>=2.0
 sphinx>=1.5,<4.0
 click>=6.0,<8.0
 docutils
