update nvim

lua/phoenix/utils/char_at.lua

@@ -0,0 +1,9 @@
+-- Helper function to return a character from a string.
+-- @param str {string}
+-- @param index {number}
+-- @returns {string}
+local char_at = function(str, index)
+  return string.sub(str, index, index)
+end
+
+return char_at