upgrade to phpactor 0.12.0

Author: kermorgant

composer.json

@@ -18,7 +18,7 @@
         "psr-4": {"EmacsPHP\\Phpactor\\Sample\\": "tests/src/"}
     },
     "require": {
-        "phpactor/phpactor": "^0.11.1"
+        "phpactor/phpactor": "^0.12.0"
     },
     "config": {
         "classmap-authoritative": true,