correctly initialize size

src/de/uni_passau/fim/seibt/gitwrapper/repo/GitWrapper.java

@@ -228,7 +228,7 @@ public class GitWrapper extends ToolWrapper {
      * @return the result of the execution
      */
     public Optional<ExecRes> exec(File workingDirectory, String firstParameter, String... parameters) {
-        List<String> pars = new ArrayList<>(defaultOptions.size() + ((parameters != null) ? parameters.length : 0));
+        List<String> pars = new ArrayList<>(defaultOptions.size() + ((parameters != null) ? parameters.length + 1 : 1));
 
         pars.addAll(defaultOptions);
         pars.add(firstParameter);