message: Update operators.md
  Cache was removed.
diff: @@ -207,7 +207,6 @@ There are operators for different purposes, and they may be categorized as: crea
  ### Multicasting Operators
  -- [`cache`](../class/es6/Observable.js~Observable.html#instance-method-cache)
  - [`multicast`](../class/es6/Observable.js~Observable.html#instance-method-multicast)
  - [`publish`](../class/es6/Observable.js~Observable.html#instance-method-publish)
  - [`publishBehavior`](../class/es6/Observable.js~Observable.html#instance-method-publishBehavior)
  