add line return to Sample Images function

[HaleySchuhl]

add in a line return to the step where new snapshot info CSVs are getting printed out

Type of update
Is this a:

• Bug fix

Associated issues

• closes sample_images function does not output line returns #855

Additional context
Add any other context about the problem here.

[codecov]

Codecov Report

Merging #856 (2ac8263) into master (aecd599) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #856    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          153       142    -11     
  Lines         6781      6055   -726     
==========================================
- Hits          6781      6055   -726     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
plantcv/utils/sample_images.py	100.00% <100.00%> (ø)
plantcv/__init__.py	100.00% <0.00%> (ø)
plantcv/plantcv/_debug.py	100.00% <0.00%> (ø)
plantcv/plantcv/classes.py	100.00% <0.00%> (ø)
plantcv/plantcv/plot_image.py	100.00% <0.00%> (ø)
plantcv/plantcv/print_image.py	100.00% <0.00%> (ø)
plantcv/plantcv/photosynthesis/__init__.py	100.00% <0.00%> (ø)
...lantcv/plantcv/photosynthesis/read_cropreporter.py	100.00% <0.00%> (ø)
plantcv/plantcv/_show_dataarray.py
plantcv/plantcv/homology/constella.py
... and 9 more

[nfahlgren]

Thanks @HaleySchuhl!