doc: updated changelog and credits.

doc/changelog.dox

@@ -110,6 +110,9 @@ See also:
     Gradle involved. See @ref platforms-android-apps for more information.
 -   The `Magnum::AndroidApplication` target was missing a few dependency
     libraries when Magnum was used as a CMake subproject
+-   Fixed an ambiguous overload error in @ref Text::GlyphCache when compiling
+    this library under C++17 (see
+    [mosra/magnum#297](https://github.com/mosra/magnum/pull/297))
 
 @subsection changelog-latest-bugfixes Bug fixes
 

doc/credits.dox

@@ -125,6 +125,8 @@ Are the below lists missing your name or something's wrong?
     fixes, Windows buildsystem improvements
 -   **Olga Turanksaya** ([\@olga-python](https://github.com/olga-python)) ---
     Gentoo ebuild
+-   **Pascal Thomet** ([\@pthom](https://github.com/pthom)) --- C++17
+    compilation fixes, buildsystem improvements
 -   **Sam Spilsbury** ([\@smspillaz](https://github.com/smspillaz)) --- WebGL
     and GLES fixes
 -   **Samuel Kogler** ([\@skogler](https://github.com/skogler)) ---