added thematic break to paragraph

ts/docx/paragraph.ts

@@ -1,4 +1,5 @@
 import {P, Attributes, ParagraphProperties, Run} from "./xml-components";
+import {ThematicBreak} from "./border";
 
 class Style {
     private pStyle: Array<P>;
@@ -88,4 +89,9 @@ export class Paragraph {
         this.properties.push(new Alignment("both"));
         return this;
     }
+
+    pageBreak() {
+        this.properties.push(new ThematicBreak());
+        return this;
+    }
 }

ts/tests/paragraphTest.ts

@@ -76,4 +76,13 @@ describe('Paragraph', () => {
             assert(newJson.p[1].pPr[1].jc[0]._attrs.val === "center");
         });
     });
+
+    describe("#pageBreak()", () => {
+        it("should add thematic break to JSON", () => {
+            paragraph.pageBreak();
+            var newJson = jsonify(paragraph);
+            
+            assert.isDefined(newJson.p[1].pPr[1].pBdr);
+        });
+    });
 });