docs(skipLast): updated decision tree, MIGRATION.md and operators.md

MIGRATION.md

@@ -110,7 +110,6 @@ enabling "composite" subscription behavior.
 |`shareValue`|No longer implemented|
 |`singleInstance`|`share`|
 |`skipLastWithTime`|No longer implemented|
-|`skipLast`|No longer implemented|
 |`skipUntilWithTime`|No longer implemented|
 |`slice(start, end)`|`skip(start).take(end - start)`|
 |`some`|`first(fn, () => true, false)`|

doc/decision-tree-widget/tree.yml

@@ -59,6 +59,11 @@ children:
         - label: based on custom logic
           children:
           - label: skipWhile
+      - label: from the end of the Observable
+        children:
+        - label: based on a given amount
+          children:
+          - label: skipLast
       - label: until another Observable emits a value
         children:
         - label: skipUntil

doc/operators.md

@@ -178,6 +178,7 @@ There are operators for different purposes, and they may be categorized as: crea
 - [`sampleTime`](../class/es6/Observable.js~Observable.html#instance-method-sampleTime)
 - [`single`](../class/es6/Observable.js~Observable.html#instance-method-single)
 - [`skip`](../class/es6/Observable.js~Observable.html#instance-method-skip)
+- [`skipLast`](../class/es6/Observable.js~Observable.html#instance-method-skipLast)
 - [`skipUntil`](../class/es6/Observable.js~Observable.html#instance-method-skipUntil)
 - [`skipWhile`](../class/es6/Observable.js~Observable.html#instance-method-skipWhile)
 - [`take`](../class/es6/Observable.js~Observable.html#instance-method-take)