anchor.diff:  
   [source,clojure]
   ----
  -(require '[tick.cal :refer [easter-fridays]])
  +(require '[tick.cal])
   
   (def holidays
     (interleave-timelines
  -    (timeline (bank-holiday-mondays))
  -    (timeline (easter-fridays))))
  +    (timeline (tick.cal/bank-holiday-mondays))
  +    (timeline (tick.cal/easter-fridays))))
   ----
   
   == Schedules
  
positive.code: 
  [source,clojure]
  ----
  (def schedule (t/schedule println timeline))
  
  (t/start schedule (t/clock-ticking-in-seconds))
  ----
  
  You can `stop`, `pause` and `resume` schedules too.
  
negative.code: 
  [source,clojure]
  ----
  (def simulator (tick.schedule/simulate println timeline))
  
  (tick.schedule/start simulator (tick.clock/fixed-clock ...))
  ----
  
  If you want to wait for a ticker to complete its journey over a
  