remove bad characters in rtd-env.yml
remove bad characters in rtd-env.yml

scikit-rf/scikit-rf,Ttl/scikit-rf,Ttl/scikit-rf,temmeand/scikit-rf,Ttl/scikit-rf,temmeand/scikit-rf,scikit-rf/scikit-rf,jhillairet/scikit-rf,jhillairet/scikit-rf,jhillairet/scikit-rf,Ttl/scikit-rf,temmeand/scikit-rf