Update changelog for 2.0.0-1 release

debian/changelog

+php-phpdocumentor-reflection-common (2.0.0-1) experimental; urgency=medium
+
+  * Document gbp import-ref usage
+  * Use debian/clean for directories
+  * Adapt packaging to restored tests
+  * Drop get-orig-source target
+  * Use https in debian/
+  * Use debhelper-compat 12
+  * Update Standards-Version to 4.3.0
+
+ -- David Prévot <taffit@debian.org>  Sun, 30 Jun 2019 23:08:06 -1000
+
 php-phpdocumentor-reflection-common (2.0.0~beta1-1) experimental; urgency=medium
 
   * Update Standards-Version to 4.2.0