Support slim versions up to 1.2.2
Support slim versions up to 1.2.2

Fixes #21.
flintinatux/skim,gkopylov/skim,appjudo/skim,Nikita-V/skim,jfirebaugh/skim,jfirebaugh/skim,gkopylov/skim,appjudo/skim,flintinatux/skim,Boltmade/skim,Boltmade/skim,Nikita-V/skim