config: remove xrender-sync

Deprecated since v5

Signed-off-by: Yuxuan Shui <[email protected]>

config: remove xrender-sync

Deprecated since v5

Signed-off-by: Yuxuan Shui <[email protected]>

Update CONTRIBUTORS

Signed-off-by: Yuxuan Shui <[email protected]>

Changes

Only change since v7.4 is the rename from `compton` to `picom`, which is
backported from the `next` branch.

As a user, you don't need to update to this version.

As a distro packager, you should only package this version if you want
to adopt "picom" as the package name.

v7.4

- Fix several memory leaks, thanks to @liskin (yshui#236)

v7.3

- Build changes:
  - Vendor test.h so people building from the release tarballs doesn't
    have to clone that repository with git

v7.2:

- Fixes:
  - Stopped compton from sometimes freezing the X server when dbus is
    enabled.
  - Fixed the example dbus scripts.

v7.1

- Fixes:
  - Fixed yshui#209
  - Fixed assertion failures, bugs, and memory leaks in experimental
    backends