Upstream changes:
== Ruby-GNOME2 3.3.6: 2019-03-21
This is a follow-up release of 3.3.5.
=== Changes
==== Ruby/GIO2
* Improvements
* (({Gio::File#read})): Added support for block.
* (({Gio::File.open})): Added support for (({Pathname})).
* (({Gio::InputStream.open})): Added support for block.
==== Ruby/CairoGObject
* Fixes
* Fixed a bug that old cairo may be used.
==== Ruby/GObjectIntrospection
* Fixes
* Fixed a bug that 64bit integer conversion may be failed for
large integer.
* Fixed typos.
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