Update URLs in vignette

Author: FelixErnst

vignettes/ROCR.Rmd

@@ -82,8 +82,8 @@ provides a general introduction into evaluating scoring classifiers with a focus
 on ROC graphs.
 
 Although functions for drawing ROC graphs are provided by the Bioconductor
-project (http://www.bioconductor.org) or by the machine learning package Weka
-(http://www.cs.waikato.ac.nz/ml), for example, no comprehensive evaluation suite
+project (https://www.bioconductor.org) or by the machine learning package Weka
+(https://www.cs.waikato.ac.nz/ml), for example, no comprehensive evaluation suite
 is available to date. ROCR is a flexible evaluation package for R
 (https://www.r-project.org), a statistical language that is widely used in
 biomedical data analysis. Our tool allows for creating cutoff-parametrized