Lower minitest dependency to >= 4.2.0.
Lower minitest dependency to >= 4.2.0.

petergoldstein/dalli,jcxplorer/dalli,hirocaster/dalli,leonid-shevtsov/dalli,mperham/dalli,freeatnet/dalli,eagletmt/dalli,akihiro17/dalli,shaiguitar/dalli,jjb/dalli,ScotterC/dalli,dannyfallon/dalli,mumoshu/dalli,eileencodes/dalli,jaxi/dalli,petergoldstein/dalli,exact/dalli,uzzz/dalli,indirect/dalli,nitinstp23/dalli,mcka1n/dalli,dtakahas/dalli,dplummer/dalli,arthurnn/dalli,wjordan/dalli,mrb/dalli,IFTTT/dalli,vipulnsward/dalli