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Retain numbering id in list paragraphs

See original GitHub issue

Assume you have a document with 2 level 0 ordered lists:

1. one
2. two
Something else
3. three
Something else
1. one
2. two

the numbering information provided in the AST node does not contain the information about the numbering, so it’s not possible to continue the first list after the non-list paragraph.

document[8]
├─0 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0"}
│   └─0 run[1]
│       └─0 text "One"
├─1 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0"}
│   └─0 run[1]
│       └─0 text "Two"
├─2 paragraph[1]
│   │ styleId: "Normal"
│   └─0 run[1]
│       └─0 text "Something else"
├─3 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0"}
│   └─0 run[1]
│       └─0 text "Three"
├─4 paragraph[1]
│   └─0 run[1]
│       └─0 text "Something else"
├─5 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0"}
│   └─0 run[1]
│       └─0 text "One"
├─6 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0"}
│   └─0 run[1]
│       └─0 text " Two"
└─7 paragraph[0]

If the numId would be added to the numbering information, it would be possible to detect the continuation.

document[8]
├─0 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0","numId":"1"}
│   └─0 run[1]
│       └─0 text "One"
├─1 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0","numId":"1"}
│   └─0 run[1]
│       └─0 text "Two"
├─2 paragraph[1]
│   │ styleId: "Normal"
│   └─0 run[1]
│       └─0 text "Something else"
├─3 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0","numId":"1"}
│   └─0 run[1]
│       └─0 text "Three"
├─4 paragraph[1]
│   └─0 run[1]
│       └─0 text "Something else"
├─5 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0","numId":"4"}      <<========
│   └─0 run[1]
│       └─0 text "One"
├─6 paragraph[1]
│   │ styleId: "ListParagraph"
│   │ numbering: {"isOrdered":true,"level":"0","numId":"4"}
│   └─0 run[1]
│       └─0 text " Two"
└─7 paragraph[0]

diff --git a/lib/docx/numbering-xml.js b/lib/docx/numbering-xml.js
index 64c4210..a68fbf4 100644
--- a/lib/docx/numbering-xml.js
+++ b/lib/docx/numbering-xml.js
@@ -15,13 +15,16 @@ function Numbering(nums, abstractNums, styles) {
         }),
         "paragraphStyleId"
     );

     function findLevel(numId, level) {
         var num = nums[numId];
         if (num) {
             var abstractNum = abstractNums[num.abstractNumId];
             if (abstractNum.numStyleLink == null) {
-                return abstractNums[num.abstractNumId].levels[level];
+                var lvl = abstractNums[num.abstractNumId].levels[level];
+                return Object.assign({numId: numId}, lvl);
             } else {
                 var style = styles.findNumberingStyleById(abstractNum.numStyleLink);
                 return findLevel(style.numId, level);