Update conf.py

Author: mcbarton

docs/source/conf.py

@@ -9,6 +9,7 @@
 if on_rtd:
     XEUS_CPP_ROOT = os.path.abspath('../..')
     command_emscripten = 'cd ../../;\
+                          chsh -s /bin/bash;\
                           curl -L https://micro.mamba.pm/api/micromamba/linux-64/latest | tar -xvj bin/micromamba;\
                           export PATH="$PWD/bin:$PATH"; \
                           export MAMBA_EXE="$PWD/bin/micromamba";\