Merge branch '3.0'

* 3.0:
  Updated all the README files
  [TwigBundle] Fix failing test on appveyor
  Improved the error message when using "@" in a decorated service
  Improve error reporting in router panel of web profiler
  [DoctrineBridge][Form] Fix performance regression in EntityType
  [FrameworkBundle] Fix a regression in handling absolute and namespaced template paths
  Allow to normalize \Traversable
  minor [Form] fix tests added by #16886
  Remove _path from query parameters when fragment is a subrequest and request attributes are already set Added tests for _path removal in FragmentListener
  Simplified everything
  Added a test
  Fixed the problem in an easier way
  Fixed a syntax issue
  Improved the error message when a template is not found
  [CodingStandards] Conformed to coding standards
  [TwigBundle] fixed Include file locations in "Template could not be found" exception

Author: fabpot

README.md

@@ -1,14 +1,14 @@
 PropertyAccess Component
 ========================
 
-PropertyAccess reads/writes values from/to object/array graphs using a simple
-string notation.
+The PropertyAccess component provides function to read and write from/to an
+object or array using a simple string notation.
 
 Resources
 ---------
 
-You can run the unit tests with the following command:
-
-    $ cd path/to/Symfony/Component/PropertyAccess/
-    $ composer install
-    $ phpunit
+  * [Documentation](https://symfony.com/doc/current/components/property_access/index.html)
+  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+  * [Report issues](https://github.com/symfony/symfony/issues) and
+    [send Pull Requests](https://github.com/symfony/symfony/pulls)
+    in the [main Symfony repository](https://github.com/symfony/symfony)