[dts] [announce] DTS 19.11 released

[Tu, Lijuan]

A new major release is available:
	https://git.dpdk.org/tools/dts/snapshot/dts-19.11.tar.xz

There will a big change in dts, please be noticed.

Snice Python 2 is retired by April 2020, dts-20.05 will not support Python 2 but only support Python 3, therefore, please be aware that dts-20.02 is the last version that support Python2.

As an alternative, dts-20.02 will both support Python 2 and Python 3, but because Python 3 is NOT backwards-compatible, we will have master branch to support Python2, and next branch to support Python 3, if you want to move to Python 3 at early stage, you can checkout to next branch.

In short, dts-20.02 will release 2 version, one is for Python2, and the other is for Python 3, dts-20.05 will release one version as usual but only support Python 3. After 20.05, Python 2 is not supported by dts.

Thanks everyone, really appreciate your contributions.