To prevent hiting raw.githubusercontent.com quota.

Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>

Change-Id: I3705746a5fe766d16ff4cf0ce4901d8c81a9da55
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ui/+/192207
Tested-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>