v4.2.0: Ruby 3 support

This release brings Roxml into alignment with Ruby 3.0+.

Thanks to @ibrahim-saifee and @pat for contributing to this release, and thanks to @anthonyhamou, @amitminfobeans, and @jacobjlevine for helping motivate it.

v4.1.1: Frozen strings

This fixes a bug involving frozen :from arguments, as fixed in #72.

Thanks @khataev for the contribution.

Adds Ruby 2.7 support

Thanks to everyone who pushed for this release, including: @anaprimawaty, @ianwremmel, @mmcnickle-float, @jacobjlevine, @lostapathy, @rmacklin

Enhancements

• Support for the current BigDecimal apis, introduced in Ruby 2.7.0. #62

Known Issues

• Use of roxml_naming_convention currently triggers deprecation warnings of the sort: URI.escape/unescape is obsolete

The first release in a long time: Ruby 2.4 support and plenty of fixes

Thanks @lostapathy for motivating the release. 👍

Enhancements

• Ruby 2.4 support #56
• Don't define errors descending from ArgumentError rather than Exception #58
• Return the default value when an attribute is present but empty #60
• Remove support for Rails < 4

Bug fixes

• fix errors in namespace writing #52
• namespaceify all elements of an xpath, rather than just the first #49
• fix the :else option to also work when creating a new object #44
• fix array default reader to always return the same object #46

Miscellaneous

• Switch from jeweler to juwelier
• Switch from test-unit to minitest
• Upgrade to rspec > 3 and modern rspec syntax
• Remove references to the defunct rubyforge.org