link to article added

README.md

@@ -20,7 +20,7 @@ is either available via http://htsvis.dkfz.de/ or can be installed as an R packa
 Shiny allows that the usage of the application in the default web browser does not require any bioinformatics training.
 Input data can either be a result file obtained upon analysis with the Bioconductor/R package cellHTS or a generic table with raw or analyzed data from, e.g. a high-content microscopy screen. Any data has to be aggregated per well. Tools to aggregate single cell data from microscopy screens are available in CellProfiler Analyst, for example.  </br> 
 </br> 
-HTSvis is now published and can be found at doi: 10.1093/bioinformatics/btx319  </br> 
+HTSvis is now published and can be found at https://doi.org/10.1093/bioinformatics/btx319  </br> 
  </br> 
 ## Installation
 HTSvis is provided as an R package and requires R version 3.1.2 for installation