Add 'Line' annot for points p1 and p2.

def addLineAnnot(self, p1, p2):
        """Add 'Line' annot for points p1 and p2."""
        CheckParent(self)

        val = _fitz.Page_addLineAnnot(self, p1, p2)

        if not val: return
        val.thisown = True
        val.parent = weakref.proxy(self)
        self._annot_refs[id(val)] = val

        return val