fix changes where brew php paths now include @ and semver-style versions in paths (#545)

Author: james2doyle

cli/Valet/Brew.php

@@ -182,7 +182,7 @@ function linkedPhp()
         $resolvedPath = $this->files->readLink('/usr/local/bin/php');
 
         return $this->supportedPhpVersions()->first(function ($version) use ($resolvedPath) {
-            return strpos($resolvedPath, "/$version/") !== false;
+            return strpos(preg_replace('/([@|\.])/', '', $resolvedPath, "/$version/")) !== false;
         }, function () {
             throw new DomainException("Unable to determine linked PHP.");
         });

cli/Valet/PhpFpm.php

@@ -113,6 +113,8 @@ function fpmConfigPath()
             'php56' => '/usr/local/etc/php/5.6/php-fpm.conf',
         ];
 
-        return $confLookup[$this->brew->linkedPhp()];
+        $key = preg_replace('/([@|\.])/', '', $this->brew->linkedPhp());
+
+        return $confLookup[$key];
     }
 }