Update changelog/readme

CHANGELOG.markdown

@@ -61,6 +61,8 @@ with the exception of the current default winit feature/dep version. Additionall
       - If you're using `DEP_IMGUI_DEFINE_`s for this already, then no change is needed.
     - If you're using `.cargo/config` to apply a build script override and link against a prebuilt `Dear Imgui` (or something else along these lines), you need to ensure you link with a version that was built using `-DIMGUI_USE_WCHAR32`.
 
+- Support for the freetype font rasterizer. Enabled by the non-default `freetype` feature, e.g `imgui = {version = "...", features=["freetype"]})`
+
 ## [0.7.0] - 2021-02-04
 
 - Upgrade to [Dear ImGui v1.80](https://github.com/ocornut/imgui/releases/tag/v1.80). (Note that the new table functionality is not yet supported, however)

README.markdown

@@ -47,6 +47,7 @@ Window::new(im_str!("Hello world"))
   for more information and justification for this design.
 - Easy integration with Glium / pre-ll gfx (renderer)
 - Easy integration with winit (backend platform)
+- Optional support for the freetype font rasterizer
 
 ## Choosing a backend platform and a renderer