let make deps pipenv install use pre releases

The problem appeared as black seems to be a pre-release, cf.
https://github.com/microsoft/vscode-python/issues/5171.

1 files changed, 4 insertions, 1 deletions

diff --git a/Pipfile b/Pipfile
index 0032452..d862b07 100644
--- a/Pipfile
+++ b/Pipfile
@@ -6,7 +6,10 @@ verify_ssl = true
 [dev-packages]
 
 [packages]
-fuzzycat = {editable = true, path = "."}
+fuzzycat = {editable = true, extras = ["dev"], path = "."}
 
 [requires]
 python_version = "3.7"
+
+[pipenv]
+allow_prereleases = true