Update README.md (#230)

* Update README.md

Change outdated link to the Handbook “Background modeling and Foreground Detection for video surveillance:  Traditional and Recent Approaches, Benchmarking and Evaluation"

* Update README.md

delete an accidental character

README.md

@@ -135,7 +135,7 @@ month     = {Jun},
 url       = {https://github.com/andrewssobral/bgslibrary}
 }
 ```
-A chapter about the BGSLibrary has been published in the handbook on [Background Modeling and Foreground Detection for Video Surveillance](https://sites.google.com/site/backgroundmodeling/).
+A chapter about the BGSLibrary has been published in the handbook on [Background Modeling and Foreground Detection for Video Surveillance](https://sites.google.com/site/backgroundsubtraction/).
 ```
 @incollection{bgslibrarychapter,
 author    = {Sobral, Andrews and Bouwmans, Thierry},