Update shoulda-matchers to 4.0.1
Fix the deprecation warning:
warning: BigDecimal.new is deprecated; use BigDecimal() method instead.
It was resolved in: https://github.com/thoughtbot/shoulda-matchers/commit/0c07bfb039b0fe9f9863e885ee3885e48f3b39d9
The 4.0.0 release changelog:
- Rails 5.x support
- Ruby 2.4+ support
- Improve negative versions of validation matchers
- Drop support for Ruby 2.0 and 2.1
- Drop support Rails 4.0 and 4.1
Edited by Toon Claes