The start of something beautiful

vendor/doctrine/persistence/CONTRIBUTING.md

@@ -0,0 +1,11 @@
+# Circular dependency
+
+This package has a development dependency on `doctrine/common`, which has a
+regular dependency on this package (`^2.0` at the time of writing).
+
+To be able to use Composer, one has to let it understand that this is version 2
+(even when developing on 3.0.x), as follows:
+
+```shell
+COMPOSER_ROOT_VERSION=2.0 composer update -v
+```