Small fix on path for update (#527)
Small fix on path for update (#527)

Running 
```
 sudo /opt/anaconda3/bin/conda install -c fastai fastai
```
resulted in an ```command not found``` error 

Instead running ```sudo /opt/anaconda3/bin/conda install -c fastai fastai``` updated the library.
fastai/course-v3,fastai/course-v3,fastai/course-v3,fastai/course-v3,fastai/course-v3,fastai/course-v3,fastai/course-v3