Hello,

I’m having trouble getting the ‘ImageJ-with-Python-Kernel’ jupyter notebook to run as expected. I’ve tried both a local install and also a Google Colab install of `pyimagej`

and either approach fails at the same place in the same way.

```
import numpy as np
arr1 = np.array([[1, 2], [3, 4]])
arr2 = np.array([[5, 6], [7, 8]])
arr_output = ij.py.new_numpy_image(arr1)
ij.op().run('multiply', ij.py.to_java(arr_output), ij.py.to_java(arr1), ij.py.to_java(arr2))
arr_output
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-9-8db1978bb24f> in <module>()
4 arr_output = ij.py.new_numpy_image(arr1)
5
----> 6 ij.op().run('multiply', ij.py.to_java(arr_output), ij.py.to_java(arr1), ij.py.to_java(arr2))
7 arr_output
AttributeError: 'net.imagej.ops.OpService' object has no attribute 'run'
```

The jupyter notebook demonstrating this is here: pyimagej_example.

Any suggestions appreciated.