Allow exporting from stocks/ca/hcorr

[alexferrari88]

Description

The exporting function for stocks/ca/hcorr is documented but not implemented as reported by issue #1752. This PR solves that.

How has this been tested?

$> stocks/ca
$ stocks/ca> set XLE,XLK,XLY,XLI,XLP,XLC,XLV,XLF,XLU,XLB,XLRE
$ stocks/ca> hcorr --export png

Checklist:

• Update our Hugo documentation following these guidelines.
• 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 scripts file.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My code passes all the checks pylint, flake8, black, ... To speed up development you should run pre-commit install.
• New and existing unit tests pass locally with my changes. You can test this locally using pytest tests/....

[DidierRLopes]

Nice work @alexferrari88 !! 🦋

[DidierRLopes]

@alexferrari88 you just need to have linting tests to pass. You can do black file path

[alexferrari88]

btw this is my first ever PR for a public project so forgive my naivete :)

[DidierRLopes]

btw this is my first ever PR for a public project so forgive my naivete :)

We hope that this is the first of many 🤩

[jmaslek]

btw this is my first ever PR for a public project so forgive my naivete :)

This project was my first PR on a public project as well :)

[piiq]

@alexferrari88 legend! 🚀