doc: updated changelog.

doc/changelog.dox

@@ -38,6 +38,17 @@ See also:
 
 @section changelog-latest Changes since 2018.02
 
+@subsection changelog-latest-new New features
+
+-   Initial support for OpenGL ES 3.2 and OpenGL 4.6
+-   New OpenGL extension support:
+    -   @extension{ARB,texture_filter_anisotropic}
+    -   @extension{OES,texture_float}, @extension2{OES,texture_half_float,OES_texture_float}
+    -   @extension{EXT,color_buffer_float}, @extension2{EXT,color_buffer_half_float,EXT_color_buffer_half_float} and
+        their WebGL counterparts @webgl_extension{EXT,color_buffer_half_float},
+        @webgl_extension{WEBGL,color_buffer_float},
+        @webgl_extension{EXT,color_buffer_float}
+
 @subsection changelog-latest-compatibility Potential compatibility breakages, removed APIs
 
 -   Removed the @cpp Buffer::Usage @ce enum that was deprecated in 2014.01, use