Upgrade from 4.x to 5.0

All services are using FQCN as service ID.
We use PSR-18 and PSR-17 instead of HTTPlug.
Renamed HttpClientInterface to AnalyticsClientInterface
Renamed DataFetcher to AnalyticsDataFetcher
Updated return value of AnalyticsDataFetcher::getPageViews to support more flexible queries.
Added PHP7 type hints

Upgrade from 3.2.2 to 4.0

Class parameters has been removed to comply with the new Symfony best practices.
Updated namespace from Happyr\Google\AnalyticsBundle to Happyr\GoogleAnalyticsBundle.
Updated service names to include an underscore. Previous: happyr.google.analytics.data_fetcher Now: happyr.google_analytics.data_fetcher
New method signature for DataFetcher::getPageViews
We do now use PSR6 cache and Httplug for HTTP messaging.
Use PSR-4
Not dependent on Guzzle. We use HTTPlug instead.