Updated README

Author: asimlqt

README.md

@@ -3,7 +3,7 @@
 > Note: This library has been updated to v3 and it is not backwards compatible with v2 so please test/update your code appropriately before upgrading.
 
 # Contents
-* [Intrduction](#introduction)
+* [Introduction](#introduction)
 * [Installation](#installation)
 * [Bootstrapping](#bootstrapping)
 * [Retrieving a list of spreadsheets](#retrieving-a-list-of-spreadsheets)