Merge ElementsProject#754: Update link from README.md to assets tutorial

14126f8 Fix typo in README.md for link to assets tutorial (Philippe McLean)

Pull request description:

Tree-SHA512: 8f6f059b0e310e47e69ce0beb93c8543ba2d971839495f7a3e00464b49ed294467da563c65bbdc9d0e2dbdee5d66b09fec250ce5fc34e67e08d8785b9276cf81

Author: instagibbs

README.md

@@ -29,7 +29,7 @@ and amounts are blinded yet auditable through the use of applied cryptography.
 
  * [Announcement of Confidential Assets](https://blockstream.com/2017/04/03/blockstream-releases-elements-confidential-assets.html)
  * [Confidential Assets Whitepaper](https://blockstream.com/bitcoin17-final41.pdf) to be presented [April 7th at Financial Cryptography 2017](http://fc17.ifca.ai/bitcoin/schedule.html) in Malta
- * [Confidential Assets Tutorial](contrib/assets_tutorial/assets_tutorial.sh)
+ * [Confidential Assets Tutorial](contrib/assets_tutorial/assets_tutorial.py)
  * [Confidential Assets Demo](https://github.com/ElementsProject/confidential-assets-demo)
  * [Elements Code Tutorial](https://elementsproject.org/elements-code-tutorial/overview) covering blockchain configuration and how to use the main features.