Refactor update_package_manager_data method

[Deborah-Digges]

Fixes #106

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

• Refactors the method update_package_manager_data into 2 methods

[42B]

Looks like this is indented 4 spaces too far.

[42B]

Is there any reason why you wouldn't change some of these to elif statements? If url == 'https://www.nuget.org/packages/SendGrid', it couldn't also be equal to 'https://www.nuget.org/packages/SendGrid.CSharp.HTTP.Client'. All of the checks using == would be prime candidates but some of the if statements which use in would have to be thought about more.

For example, there might be a url which satisfies both of these checks:

        if 'pypi' in url and 'sendgrid' in url:
            data["num_python_downloads"] = self.python_downloads(url)
        if 'pypi' in url and 'python_http_client' in url:
            data["num_python_http_client_downloads"] = self.python_downloads(url)