add a changelog entry

diff --git a/doc/news/changes/incompatibilities/20200512Maier b/doc/news/changes/incompatibilities/20200512Maier
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--- a/doc/news/changes/incompatibilities/20200512Maier
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@@ -1,3 +0,0 @@
-List rotated: The list of incompatibilities is now empty.
-<br>
-(Matthias Maier, 2020/05/12)

diff --git a/doc/news/changes/incompatibilities/20200521Maier b/doc/news/changes/incompatibilities/20200521Maier
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+Updated: deal.II now requires a compiler with enabled C++14 support.
+<br>
+(Matthias Maier, 2020/05/21)

diff --git a/doc/news/changes/incompatibilities/20200521Maier-2 b/doc/news/changes/incompatibilities/20200521Maier-2
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+Removed: The <code>DEAL_II_WITH_CXX14</code> and
+<code>DEAL_II_WITH_CXX17</code> configuration options have been removed.
+The library will now be compiled with the defaultr C++ standard enabled by
+the compiler. This is (as of May 2020) C++14 for all compilers. If you want
+to override that behavior, please set the C++ standard directly for example
+by configuring with <code>-DDEAL_II_CXX_FLAGS="-std=c++17"</code>, or by
+setting the environement variable <code>CXXFLAGS="-std=c++17".
+<br>
+(Matthias Maier, 2020/05/21)