Trying to use conda init bash command recommened by Travis

ci/build_docs.sh

@@ -2,6 +2,7 @@
 # Adapted from the ci/build_docs.sh file from the pandas and pyart project
 # https://github.com/pydata/pandas
 set -e
+conda init bash
 
 echo "Installing sphinx, etc. to build the documentation ..."
 cd "$TRAVIS_BUILD_DIR"