chore: drop future from requirements.txt
diff --git a/requirements.txt b/requirements.txt
index f28906a..faefb77 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
-future==0.18.2
 # frappe   # https://github.com/frappe/frappe is installed during bench-init
 gocardless-pro~=1.22.0
 googlemaps  # used in ERPNext, but dependency is defined in Frappe