feat(ft): add editorconfig support (#295)

Note: `;` is an alternate syntax for comments and also picked up by nvim.

Author: matu3ba

lua/Comment/ft.lua

@@ -52,6 +52,7 @@ local L = setmetatable({
     dhall = { M.dash, M.haskell_b },
     dosbatch = { 'REM%s' },
     dot = { M.cxx_l, M.cxx_b },
+    editorconfig = { M.hash },
     eelixir = { M.html, M.html },
     elixir = { M.hash },
     elm = { M.dash, M.haskell_b },