Allow to use any symfony/process version

.gitignore

@@ -1,4 +1,5 @@
 vendor
+composer.lock
 
 # TEST
 files

composer.json

@@ -2,11 +2,6 @@
     "name": "ngekoding/office-to-pdf",
     "description": "Convert any office files to pdf format",
     "type": "library",
-    "config": {
-      "platform": {
-        "php": "5.6"
-      }
-    },
     "license": "MIT",
     "authors": [
       {
@@ -20,6 +15,6 @@
       }
     },
     "require": {
-        "symfony/process": "^3.4"
+        "symfony/process": "*"
     }
 }

src/Converter.php

@@ -86,7 +86,12 @@ public function convert($source, $destination = NULL)
 
         $command = sprintf($this->baseCommand, $this->libreOfficePath, $outdir, $source);
 
-        $process = new Process($command);
+        if (method_exists(Process::class, 'fromShellCommandline')) {
+            $process = Process::fromShellCommandline($command);   
+        } else {
+            $process = new Process($command);
+        }
+
         $process->setTimeout($this->timeout);
         $process->run();