Update the sponsors sections in README.

Add --no-cache-dir flag for pip install commands (#460)

Update tools

CEF Python v66.0 release

Fix build errors (#403)

Change cef.Request.Flags options.

Update make_installer.py tool

Remove Frame.GetProperty/SetProperty deprecated methods from API docs.

This methods are not implemented. I guess they are remainings from
CEF 1 which ran using single process mode and getting/setting properties
worked synchronously. But in CEF 3 which runs in multi-process mode
you can do this only asynchronusly, you can use already implemented
js<>py communication layer for that.

Update to Chromium v57 on Win (#341) and fix PyQt5 example on Win (#325…

…).

Fix PyQt5 support on Windows in qt.py example (#325).

Update automate.py to use --ninja-jobs also when building CEF projects.
Default jobs ninja uses is very CPU intensive and can cause much lag in OS.

Update to Chromium 57.0.2987.133 on Linux PART 2 (#341)

Fix build on Linux and fix logging function on Python 3 (#352).