v0.3.0

Breaking changes

If you used composer to install the package name has changed from valu-digital/wp-graphql-polylang to valu/wp-graphql-polylang to match our Packagist org.

Other changes

• Document installation
• Publish to Packagist
• Fix graphql request detection for sub url installations
• Add contributing docs
• Fix tests with wp-graphql v0.4.x
• Use bundled composer autoloader only when not using global one