docs: Fix anchors in the readme file (#86)

Author: toofff

README.md

@@ -46,10 +46,10 @@ A lightweight and fast control to render a select component that can display hie
   * [onNodeToggle](#onnodetoggle)
   * [data](#data)
   * [placeholderText](#placeholdertext)
-  * [noMatchesText](#noMatchesText)
+  * [noMatchesText](#nomatchestext)
   * [keepTreeOnSearch](#keeptreeonsearch)
   * [simpleSelect](#simpleselect)
-  * [showPartiallySelected](#showPartiallySelected)
+  * [showPartiallySelected](#showpartiallyselected)
 * [Styling and Customization](#styling-and-customization)
   * [Using default styles](#default-styles)
   * [Customizing with Bootstrap, Material Design styles](#customizing-styles)