Update main.yml

Author: mcbarton

.github/workflows/main.yml

@@ -325,10 +325,10 @@ jobs:
                          --XeusAddon.mounts="$PREFIX/share/xeus-cpp/tagfiles:/share/xeus-cpp/tagfiles" \
                          --XeusAddon.mounts="$PREFIX/etc/xeus-cpp/tags.d:/etc/xeus-cpp/tags.d" \
                          --contents README.md \
-                   	     --contents notebooks/xeus-cpp-lite-demo.ipynb \
-                   	     --contents notebooks/smallpt.ipynb \
-                   	     --contents notebooks/images/marie.png \
-                   	     --contents notebooks/audio/audio.wav
+                         --contents notebooks/xeus-cpp-lite-demo.ipynb \
+                         --contents notebooks/smallpt.ipynb \
+                         --contents notebooks/images/marie.png \
+                         --contents notebooks/audio/audio.wav
           python -m pip install nbdime
           python -m pip install selenium
           python --driver chrome