fix: add path field to the directory model (#183)

Author: katerina20

src/main/java/com/crowdin/client/sourcefiles/model/Directory.java

@@ -15,6 +15,7 @@ public class Directory {
     private String name;
     private String title;
     private String exportPattern;
+    private String path;
     private Priority priority;
     private Date createdAt;
     private Date updatedAt;

src/test/resources/api/sourcefiles/directory.json

@@ -7,6 +7,7 @@
     "name": "main",
     "title": "<Description materials>",
     "exportPattern": "/localization/%locale%/%file_name%",
+    "path": "/main",
     "priority": "normal",
     "createdAt": "2019-09-19T14:14:00+00:00",
     "updatedAt": "2019-09-19T14:14:00+00:00"