Merge pull request #268 from MetaCell/feature/248_bokeh_plots_save

#248 Fix save bug by updating bokeh package

Author: filippomc

requirements.txt

@@ -3,7 +3,7 @@ alembic==1.4.2
 async-generator==1.10
 attrs==19.3.0
 blinker==1.4
-bokeh==2.1.1
+bokeh==2.3.1
 brotlipy==0.7.0
 cachetools==0.8.0
 cffi==1.14.0