bump gpgr version (#15)

Author: qclayssen

docker/Dockerfile.gpgr

@@ -18,7 +18,7 @@ RUN \
 
 RUN \
   conda install --prefix /env/ \
-    'r-gpgr ==2.1.3' \
+    'r-gpgr ==2.2.0' \
     'r-sigrap ==0.1.1' \
     'bioconductor-bsgenome.hsapiens.ucsc.hg38 ==1.4.5' \
     'bioconductor-txdb.hsapiens.ucsc.hg38.knowngene ==3.16.0' \