Minimal password length increased

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

config/initializers/devise.rb

@@ -101,7 +101,7 @@ Devise.setup do |config|
 
   # ==> Configuration for :validatable
   # Range for password length. Default is 6..128.
-  config.password_length = 6..128
+  config.password_length = 8..128
 
   # Email regex used to validate email formats. It simply asserts that
   # an one (and only one) @ exists in the given string. This is mainly