Removed "OJS.Diagrams" causing AppVeyor CI to fail
Removed "OJS.Diagrams" causing AppVeyor CI to fail

nakov/OpenJudgeSystem,hackohackob/OpenJudgeSystem,nakov/OpenJudgeSystem,nakov/OpenJudgeSystem,hackohackob/OpenJudgeSystem,nakov/OpenJudgeSystem,hackohackob/OpenJudgeSystem,hackohackob/OpenJudgeSystem