Fix version string (#724)

adrianeboyd · web-flow · commit 3dcd03d975f5 · 2022-07-08T11:07:52.000+02:00
diff --git a/thinc/about.py b/thinc/about.py
@@ -1,2 +1,2 @@
-__version__ = "v8.1.0"
+__version__ = "8.1.0"
 __release__ = True
