Update testenv based on yml file on travis

Author: aseyboldt

scripts/create_testenv.sh

@@ -24,13 +24,15 @@ ENVNAME="${ENVNAME:-testenv}"         # if no ENVNAME is specified, use testenv
 if [ -z ${GLOBAL} ]; then
   if conda env list | grep -q ${ENVNAME}; then
     echo "Environment ${ENVNAME} already exists, keeping up to date"
+    source activate ${ENVNAME}
+    mamba env update -f environment-dev.yml
   else
     conda config --add channels conda-forge
     conda config --set channel_priority strict
     conda install -c conda-forge mamba --yes
     mamba env create -f environment-dev.yml
+    source activate ${ENVNAME}
   fi
-  source activate ${ENVNAME}
 fi
 
 #  Install editable using the setup.py