vim-patch:8.1.0037: cannot easily append lines to another buffer

Problem:    Cannot easily append lines to another buffer.
Solution:   Add appendbufline().
ca851593a6

src/nvim/eval.lua

@@ -20,6 +20,7 @@ return {
     ['and']={args=2},
     api_info={},
     append={args=2},
+    appendbufline={args=3},
     argc={args={0, 1}},
     argidx={},
     arglistid={args={0, 2}},