Allow to inherits from Money

Signed-off-by: chatgris <jboyer@af83.com>
Update AUTHORS and CHANGELOG.md

Let's be a good oss citizen. :)

Signed-off-by: chatgris <jboyer@af83.com>
Rename set_upt_default to setup_defaults

Signed-off-by: chatgris <jboyer@af83.com>
Merge pull request #330 from chatgris/inheritance

Allow to inherits from Money
version bump to 6.0.0
Fixed typo in deprecation warning.
Merge pull request #334 from zubin/master

Fixed typo in deprecation warning.
Update AUTHORS
Fix spelling of deprecated
Fix grammar in deprecation warnings
Display line triggering deprecation warning
Excess newline removed
Changelog and authors file updated
Merge pull request #340 from tommeier/display-caller-on-deprecations

Display calling line triggering deprecation warning
Currency : add #to_str and #to_sym for implicit comnversions
Currency : add upcase/downcase cases for equality test
Add support for 1.8.7
Updated CHANGELOG and AUTHORS [ci skip]
Fix my own typo in changelog
Merge pull request #341 from jlecour/currency-to-sym

Add implicit conversions of Money::Currency