doc: updated changelog and credits.

doc/changelog.dox

@@ -619,6 +619,10 @@ See also:
     passing a freshly created @ref GL::Buffer to it was causing
     @ref GL::Renderer::Error::InvalidOperation on systems without
     @gl_extension{ARB,direct_state_access}.
+-   Fixed @ref Shaders::Vector and @ref Shaders::DistanceFieldVector to work
+    on iOS, which has only 8 texture binding slots in total (see
+    [mosra/magnum-examples#65](https://github.com/mosra/magnum-examples/issues/65)
+    and [mosra/magnum#374](https://github.com/mosra/magnum/pull/374))
 
 @subsection changelog-latest-docs Documentation
 

doc/credits.dox

@@ -114,6 +114,8 @@ Are the below lists missing your name or something's wrong?
     updates, algorithm bugfixes
 -   **Erik Wijmans** ([\@erikwijmans](https://github.com/erikwijmans)) ---
     NVidia-specific workarounds for headless EGL contexts
+-   **Florian Goujeon** ([\@fgoujeon](https://github.com/fgoujeon)) --- iOS
+    fixes in the @ref Shaders library
 -   **Gerhard de Clercq** --- Windows RT (Store/Phone) port
 -   **Guillaume Giraud** ([\@Guillaume227](https://github.com/Guillaume227)) ---
     algorithm bugfixes