more efficient addCommand() method

src/de/uni_passau/fim/seibt/gitwrapper/process/ToolWrapper.java

 package de.uni_passau.fim.seibt.gitwrapper.process;
 
 import java.io.File;
+import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
@@ -85,8 +86,10 @@ public abstract class ToolWrapper {
      * @return the command to be executed
      */
     private List<String> addCommand(List<String> parameters) {
-        LinkedList<String> pars = new LinkedList<>(parameters);
-        pars.addFirst(cmd);
+        List<String> pars = new ArrayList<>(parameters.size() + 1);
+
+        pars.add(cmd);
+        pars.addAll(parameters);
 
         return pars;
     }