refresh environment.yml
refresh environment.yml

Anaconda-Server/nbpresent,ContinuumIO/nbpresent,Anaconda-Server/nbbrowserpdf,Anaconda-Server/nbpresent,ContinuumIO/nbpresent,Anaconda-Server/nbbrowserpdf,Anaconda-Server/nbbrowserpdf,Anaconda-Server/nbpresent,ContinuumIO/nbpresent