Update packagecheck.R
Update packagecheck.R

Adding flextplot 0.7.2 and cowplot 1.0.0

TimKDJ/jasp-desktop,boutinb/jasp-desktop,vankesteren/jasp-desktop,TimKDJ/jasp-desktop,boutinb/jasp-desktop,boutinb/jasp-desktop,FransMeerhoff/jasp-desktop,TimKDJ/jasp-desktop,FransMeerhoff/jasp-desktop,boutinb/jasp-desktop,AlexanderLyNL/jasp-desktop,vankesteren/jasp-desktop,jasp-stats/jasp-desktop,AlexanderLyNL/jasp-desktop,AlexanderLyNL/jasp-desktop,FransMeerhoff/jasp-desktop,vankesteren/jasp-desktop,TimKDJ/jasp-desktop,boutinb/jasp-desktop,TimKDJ/jasp-desktop,AlexanderLyNL/jasp-desktop,vankesteren/jasp-desktop,FransMeerhoff/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,AlexanderLyNL/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,vankesteren/jasp-desktop,FransMeerhoff/jasp-desktop,jasp-stats/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,jasp-stats/jasp-desktop,vankesteren/jasp-desktop,FransMeerhoff/jasp-desktop,vankesteren/jasp-desktop,jasp-stats/jasp-desktop,FransMeerhoff/jasp-desktop,vankesteren/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,boutinb/jasp-desktop,TimKDJ/jasp-desktop,TimKDJ/jasp-desktop,TimKDJ/jasp-desktop,FransMeerhoff/jasp-desktop