Update tools

Author: sebastianbergmann

.phive/phars.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phive xmlns="https://phar.io/phive">
   <phar name="phpab" version="^1.25" installed="1.26.0" location="./tools/phpab" copy="true"/>
-  <phar name="php-cs-fixer" version="^2.16" installed="2.18.2" location="./tools/php-cs-fixer" copy="true"/>
+  <phar name="php-cs-fixer" version="^2.16" installed="2.18.3" location="./tools/php-cs-fixer" copy="true"/>
   <phar name="phpdox" version="^0.12" installed="0.12.0" location="./tools/phpdox" copy="true"/>
   <phar name="phploc" version="^4.0" installed="4.0.1" location="./tools/phploc" copy="true"/>
   <phar name="psalm" version="^4.0" installed="4.6.2" location="./tools/psalm" copy="true"/>