google-ads-php-v0.3.0

Google Ads API Client Library for PHP v0.3.0

• Added support and examples for V0_3 of Google Ads API.
• Updated GetArtifactMetadata to quote the name param value.
• Updated examples to initialize properties via constructors instead of
  setters.
• Added examples showing how to add and get ad group bid modifiers.
• Added an example showing how to create and attach shared keyword sets.
• Added an example showing how to remove shared set criteria.
• Updated hotel ad group bid modifier example with v0_3 criteria changes.
• Added AddCampaignBidModifier example.