remove 404 url

vignettes/spatial-modeling-use-case.Rmd

@@ -34,7 +34,7 @@ In some cases, spatial data is grouped, e.g. in remotely-sensed land use mapping
 This package provides a customizable toolkit for cross-validation (and bootstrap) estimation using a variety of spatial resampling schemes. 
 More so, this toolkit can even be extended to spatio-temporal data or other complex data structures. This vignette will walk you through a simple case study, crop classification in central Chile [@Pena2015].
 
-This vignette is based on code that Alex Brenning developed for his course on 'Environmental Statistics and GeoComputation' that he teaches in the [Geographic Information Science Master's program](http://www.geographie.uni-jena.de/Studium/Studierende/Studiengänge/Master+of+Science+Geoinformatik+.html) at Friedrich Schiller University Jena, Germany. 
+This vignette is based on code that Alex Brenning developed for his course on 'Environmental Statistics and GeoComputation' that he teaches at Friedrich Schiller University Jena, Germany. 
 Please take a look at our program and spread the word! 
 
 ## Data and Packages