Fix typo in Dockerfile environment name

Author: moeyensj

Dockerfile

@@ -19,5 +19,5 @@ RUN mkdir projects \
 # Create Python 3.6 conda environment and install requirements, then install THOR
 RUN cd projects/thor \
 	&& conda install -c defaults -c conda-forge -c astropy --file requirements.txt python=3.6 --y \
-	&& python -m ipykernel install --user --name thor_p36 --display-name "THOR (Python 3.6)" \
+	&& python -m ipykernel install --user --name thor_py36 --display-name "THOR (Python 3.6)" \
 	&& python setup.py install