Update environment.yaml

wrappers/topgo/environment.yaml

@@ -2,6 +2,7 @@ channels:
     - bioconda
     #- anaconda
 dependencies:
+    - r-base =3.4.1
     - bioconductor-topgo =2.30.0
     - bioconductor-biomart =2.32.1 #2.34.1 needed due to error, not 2.34.0
     - bioconductor-rgraphviz =2.22.0