use Releaser v2 config + add badge links in readme (#72)

* use Releaser v2 config + add badge links in readme

* fix badge URL

Author: eli-darkly

.ldrelease/config.yml

@@ -1,3 +1,5 @@
+version: 2
+
 repo:
   public: php-server-sdk
   private: php-server-sdk-private
@@ -6,12 +8,12 @@ publications:
   - url: https://packagist.org/packages/launchdarkly/server-sdk
     description: Packagist
 
-circleci:
-  linux:
-    image: ldcircleci/php-sdk-release:1  # built in sdks-ci-docker project, contains PHP 7.3 + phpDocumentor 3
+jobs:
+  - docker:
+      image: ldcircleci/php-sdk-release:1  # built in sdks-ci-docker project, contains PHP 7.3 + phpDocumentor 3
 
 documentation:
-  githubPages: true
+  gitHubPages: true
 
 sdk:
   displayName: "PHP"

README.md

@@ -1,6 +1,8 @@
 # LaunchDarkly Server-side SDK for PHP
 
 [![Circle CI](https://img.shields.io/circleci/project/launchdarkly/php-server-sdk.png)](https://circleci.com/gh/launchdarkly/php-server-sdk)
+[![Packagist](https://img.shields.io/packagist/v/launchdarkly/server-sdk.svg?style=flat-square)](https://packagist.org/packages/launchdarkly/server-sdk)
+[![Documentation](https://img.shields.io/static/v1?label=GitHub+Pages&message=API+reference&color=00add8)](https://launchdarkly.github.io/php-server-sdk)
 
 ## LaunchDarkly overview