* [deb][ubuntu] Dropped support for Ubuntu 14.04/17.04/17.10/18.10.
* [gstreamer] Restricted GStreamer 1.14 or later as non supported version explicitly.
* [deb][ubuntu] Added support for Ubuntu 18.04/19.04
* [homebrew] Added support for custom Homebrew path. In the previous versions,
/usr/local/share/aclocal was expected as Homebrew's aclocal path.
* [travis] Added macOS as CI target.
* [doc][tutorial] Added a description about OS that need DYLD_LIBRARY_PATH
[GitHub#41] [Patch by Douglas Lovell]
* [doc][tutorial] Updated an explanation about loading shared library.
* Fixed returning invalid address because of wrong c_str() usage in Message class.
[GitHub#39][Reported by dcb314]
* Douglas Lovell