Update readme to mention requirements.txt

[jsmentch]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Summary

Simply mentions the tutorial requirements in the readme per #272
Same change was made in the pydra-tutorial repo

Checklist

• All tests passing
• I have added tests to cover my changes
• I have updated documentation (if necessary)
• My code follows the code style of this project
  This is purely a documentation change

Acknowledgment

• I acknowledge that this contribution will be available under the Apache 2 license.

[codecov]

Codecov Report

Merging #276 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #276   +/-   ##
=======================================
  Coverage   86.76%   86.76%           
=======================================
  Files          19       19           
  Lines        3165     3165           
  Branches      841      841           
=======================================
  Hits         2746     2746           
  Misses        261      261           
  Partials      158      158           

Flag	Coverage Δ
#unittests	86.76% <ø> (ø)

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[djarecka]

thank you!

[djarecka]

@jsmentch - would you like to add your name to zenodo file? I can also add if you provide the info

[jsmentch]

@djarecka sure, thanks! Here is my info:

"affiliation": "Harvard, MIT",
"name": "Mentch, Jeff",
"orcid": "0000-0002-7762-8678"