Update PHP-CS-Fixer

Author: jrmajor

.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="1.27.1" location="./tools/phpab" copy="true"/>
-  <phar name="php-cs-fixer" version="^3.0" installed="3.6.0" location="./tools/php-cs-fixer" copy="true"/>
+  <phar name="php-cs-fixer" version="^3.0" installed="3.7.0" 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="4.22.0" location="./tools/psalm" copy="true"/>