added coveralls.io
## Bitcoin & Blockchain Technology
-Python library (and assorted material) originated from the Bitcoin and Blockchain Technology course of Milano Bicocca and Politecnico di Milano Universities. Most of the material is instrumental for teaching and homeworks.
+Python library (and assorted material) originated from the Bitcoin and Blockchain Technology course of Milano Bicocca and Politecnico di Milano Universities.
-The `btclib` folder contains Python code, namely Python3 with type annotation. It is not intended to be used in production environments, as it will probably have major refactorings with no care at all for backward compatibility.
+The `btclib` folder contains Python code, namely Python3 with type annotation. Most of the material is instrumental in teaching and homeworks, algorithms are intended for demonstration and not to be used in production environments: they could be broken using side-channel attacks! Moreover, they will probably have major refactorings without care for backward compatibility.
-develop branch [![Build Status](https://travis-ci.org/dginst/BitcoinBlockchainTechnology.svg?branch=develop)](https://travis-ci.org/dginst/BitcoinBlockchainTechnology)
+[![Build Status](https://travis-ci.org/dginst/BitcoinBlockchainTechnology.svg?branch=master)](https://travis-ci.org/dginst/BitcoinBlockchainTechnology)
-master branch [![Build Status](https://travis-ci.org/dginst/BitcoinBlockchainTechnology.svg?branch=master)](https://travis-ci.org/dginst/BitcoinBlockchainTechnology)
+[![Coverage Status](https://coveralls.io/repos/github/dginst/BitcoinBlockchainTechnology/badge.svg?branch=master)](https://coveralls.io/github/dginst/BitcoinBlockchainTechnology?branch=master)
-On GitHub Excel spreadsheets are available in the `excel` folder:
+Excel spreadsheets are available in the GitHub `excel` folder:
https://github.com/dginst/BitcoinBlockchainTechnology/excel
-Slides are available at:
+Some slides are available at:
https://bit.ly/2LecIba
