Add toolbar extension docs.

CHANGELOG.md

@@ -1,6 +1,6 @@
 ## ChangeLog
 
-###
+### 1.8.0
 
 - [bug] Fix #672: Column Fixed Width in Percentage bug.
 - [enh] Added state saving for visible columns and the ability to use extension with multiple simultaneous tables.

docs/extensions.md

@@ -25,4 +25,6 @@ lead: pages.extensions.lead
 
 {% tf extensions/filtercontrol.md %}
 
-{% tf extensions/naturalsorting.md %}
+{% tf extensions/naturalsorting.md %}
+
+{% tf extensions/toolbar.md %}