vim-patch:8.0.0749: some unicode digraphs are hard to remember

Problem:    Some unicode digraphs are hard to remember.
Solution:   Add alternatives with a backtick. (Chris Harding, closes vim/vim#1861)
816e7660e1

src/nvim/digraph.c

@@ -1359,6 +1359,12 @@ static digr_T digraphdefault[] =
   { 'f', 't', 0xfb05 },
   { 's', 't', 0xfb06 },
 
+  // extra alternatives, easier to remember
+  { 'W', '`', 0x1e80 },
+  { 'w', '`', 0x1e81 },
+  { 'Y', '`', 0x1ef2 },
+  { 'y', '`', 0x1ef3 },
+
   // Vim 5.x compatible digraphs that don't conflict with the above
   { '~', '!', 161 },  // <20>
   { 'c', '|', 162 },  // <20>