add link support to renderer

uml.py

@@ -126,6 +126,9 @@ def renderer(chain):
                     cbuf = "  "
                     cbuf += i
             print(cbuf)
+        elif i.element == "r":
+            rendered = True
+            print("=>", i.data, i.data2)
         elif i.element == "x":
             print(i.data)
         if rendered: print()
@@ -143,7 +146,6 @@ def main():
         # ignore blank lines (but not seperating paragraphs)
         if len(i) == 0 and not flags["IN_PREFORMATTED"]:
             if flags["PARA_PREV"]:
-                print("hi")
                 flags["PARA_PREV"] = False
             continue