Log Message:
devel/ruby-stomp: update to 1.4.7

## 1.4.7 20181210

* Support SSL cert/key in text format.
* Test adjustments for Artemis
* Correct missing variable name
* Fix Ruby 2.6 test indentation warning

## 1.4.6 20181105

* Fix broken JRuby support.  Issue #153.
* Rework many tests for JRuby support.
* Add optional debug output to all tests.

## 1.4.5 20181027

* Add option for no timeout on network read
* Lock check of @io.ready for SSL sockets
* Squelch some deprecation warnings
* Address issue #146
* Reintroduce named excepton on nil header
* Environmentally control some debug flags
* Raise named exception on bad server frame
* Attempt to address issue #152
* Eliminate Ruby 2.5 warnings in unit tests
* Major refactor of all gem examples