Add boto3 as a requirement

[dav3r]

🗣 Description

This PR adds boto3 to the set of required libraries for this project.

💭 Motivation and Context

I attempted to run the ssm-param script and realized that boto3 was not installed in my pyenv for this project, so this PR rectifies that.

🧪 Testing

I ran pip install --requirement requirements-dev.txt and confirmed that boto3 was indeed installed. I also ran ssm-param --help to verify that it was no longer complaining about boto3 being missing.

🚥 Types of Changes

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

✅ Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[mcdonnnj]

Makes sense to me ✔

[jsf9k]

[felddy]

Wow. I'm not sure how this was missing for so long. That ssm-param script has been around awhile. I take full responsibility. Twenty-one lashes with a wet noodle. 🍜