Remove duplicate set members.
Remove duplicate set members.

carymrobbins/intellij-haskforce,charleso/intellij-haskforce,KasperJanssens/intellij-haskforce,begray/intellij-haskforce,charleso/intellij-haskforce,KasperJanssens/intellij-haskforce,begray/intellij-haskforce,begray/intellij-haskforce,carymrobbins/intellij-haskforce,charleso/intellij-haskforce,carymrobbins/intellij-haskforce