fix(RNViewShotModule): FileNotFound exception

My previous commit didn't fixed issue with nested paths, so this commit fixes it.

android/src/main/java/fr/greweb/reactnativeviewshot/RNViewShotModule.java

             if ("file".equals(result)) {
                 if (options.hasKey("path")) {
                     file = new File(options.getString("path"));
-                    file.mkdirs();
+                    file.getParentFile().mkdirs();
                     file.createNewFile();
                 }
                 else {