add a changelog entry

diff --git a/doc/news/changes/minor/20170816MatthiasMaier b/doc/news/changes/minor/20170816MatthiasMaier
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+Improved: The CMake CUDA detection and configure has been completely
+rewritten. CUDA support now requires CMake version 3.9 or newer.
+<br>
+(Matthias Maier, 2017/08/08)