[riot-notifications] [RIOT-OS/RIOT] Update release notes with 2019.04 notes (#11381)

danpetry notifications at github.com
Thu Apr 11 20:56:32 CEST 2019

### Contribution description

Release notes for 2019.04 release

### Testing procedure

Please read through, and check that, for the area of the OS which you're familiar with, that the existing information is correct, and there are no omissions.
You can view, comment on, or merge this pull request online at:


-- Commit Summary --

  * Update release notes with 2019.04 notes

-- File Changes --

    M release-notes.txt (362)

-- Patch Links --


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