Update changelog summary.
Update changelog summary.

kmonsoor/pyglet,qbektrix/pyglet,shaileshgoogler/pyglet,gdkar/pyglet,gdkar/pyglet,kmonsoor/pyglet,odyaka341/pyglet,cledio66/pyglet,odyaka341/pyglet,mpasternak/michaldtz-fixes-518-522,google-code-export/pyglet,Alwnikrotikz/pyglet,cledio66/pyglet,mpasternak/pyglet-fix-issue-552,odyaka341/pyglet,gdkar/pyglet,shaileshgoogler/pyglet,xshotD/pyglet,shaileshgoogler/pyglet,xshotD/pyglet,kmonsoor/pyglet,google-code-export/pyglet,mpasternak/michaldtz-fixes-518-522,google-code-export/pyglet,Alwnikrotikz/pyglet,qbektrix/pyglet,cledio66/pyglet,Austin503/pyglet,Austin503/pyglet,arifgursel/pyglet,google-code-export/pyglet,xshotD/pyglet,kmonsoor/pyglet,mpasternak/michaldtz-fix-552,mpasternak/michaldtz-fix-552,mpasternak/pyglet-fix-issue-518-522,mpasternak/pyglet-fix-issue-518-522,cledio66/pyglet,Austin503/pyglet,mpasternak/pyglet-fix-issue-518-522,mpasternak/michaldtz-fixes-518-522,Alwnikrotikz/pyglet,Alwnikrotikz/pyglet,arifgursel/pyglet,gdkar/pyglet,mpasternak/pyglet-fix-issue-552,Alwnikrotikz/pyglet,cledio66/pyglet,xshotD/pyglet,arifgursel/pyglet,odyaka341/pyglet,mpasternak/pyglet-fix-issue-518-522,shaileshgoogler/pyglet,qbektrix/pyglet,Austin503/pyglet,google-code-export/pyglet,mpasternak/michaldtz-fix-552,mpasternak/michaldtz-fix-552,gdkar/pyglet,Austin503/pyglet,odyaka341/pyglet,shaileshgoogler/pyglet,mpasternak/pyglet-fix-issue-552,kmonsoor/pyglet,qbektrix/pyglet,mpasternak/pyglet-fix-issue-552,arifgursel/pyglet,qbektrix/pyglet,arifgursel/pyglet,xshotD/pyglet,mpasternak/michaldtz-fixes-518-522