bin/sandbox in solidus_afterpay-0.2.0 vs bin/sandbox in solidus_afterpay-0.3.0

@@ -20,10 +20,10 @@
 
 if [ ! -z $SOLIDUS_BRANCH ]
 then
   BRANCH=$SOLIDUS_BRANCH
 else
-  BRANCH="master"
+  BRANCH="main"
 fi
 
 extension_name="solidus_afterpay"
 
 # Stay away from the bundler env of the containing extension.