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While running `$ pip install yfinance --upgrade --no-cache-dir` I get the following error: ``` ERROR: pip's dependency resolver does not currently take into account all the packages that are installed....

**Man-in-the-Middle** `commons-httpclient:commons-httpclient` is a HttpClient component of the Apache HttpComponents project. Affected versions of this package are vulnerable to Man-in-the-Middle (MitM). due to not verifing the requesting server's hostname agains...

**Improper Certificate Validation** `commons-httpclient:commons-httpclient` is a component of the Apache HttpComponents project. Affected versions of this package are vulnerable to Man-in-the-Middle attacks due to not verifying that the requesting server...

I just recognized that inserting the same key twice, the size of the map will be increased, even if inside the keyset there will be just one key (as expected)....