vim-patch:8.0.1514: getting the list of changes is not easy

Problem:    Getting the list of changes is not easy.
Solution:   Add the getchangelist() function. (Yegappan Lakshmanan,
            closes vim/vim#2634)
07ad816525

src/nvim/eval.lua

@@ -116,6 +116,7 @@ return {
     getbufinfo={args={0, 1}},
     getbufline={args={2, 3}},
     getbufvar={args={2, 3}},
+    getchangelist={args={1, 1}},
     getchar={args={0, 1}},
     getcharmod={},
     getcharsearch={},