Update SDK_README.md

[FriendlyUser]

Description

• Fix typo in SDK_README.md

I looked and looked through the openbb documentation, on the website it suggests using openbb[all] to install all dependencies, think this documentation bug was overlooked.

How has this been tested?

Documentation change, should require no testing.

Checklist:

• I have adhered to the GitFlow naming convention and my branch name is in the format of feature/feature-name or hotfix/hotfix-name.
• Update our documentation following these guidelines. Update any user guides that are affected by the changes.
• Update our tests following these guidelines.
• Make sure you are following our CONTRIBUTING guidelines.
• If a feature was added make sure to add it to the corresponding integration test script.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.

[jmaslek]

Nice catches!

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@c7e6285). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #4461   +/-   ##
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  Coverage           ?   54.72%           
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  Files              ?      596           
  Lines              ?    53638           
  Branches           ?        0           
==========================================
  Hits               ?    29354           
  Misses             ?    24284           
  Partials           ?        0           

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