v2.0.0

Changes

• The package is renamed to elninotech/linkedin-api-client.
• Remove happyr/linkedin-api-client and require elninotech/linkedin-api-client in your composer.json
• Change all imports from Happyr\Linkedin to Elnino\Linkedin
• Request format is fixed to json, to match with v2 of the Linkedin API
• Removed simple_xml as response format
• Compatibility with httplug v2
• Compatibility with php 8