Update coc config

editors/vim/coc-settings.json

@@ -1,7 +1,34 @@
-//"languageserver": {
+{
+  "languageserver": {
+    "elmLS": {
+      "command": "elm-language-server",
+      "args": ["--stdio"],
+      "filetypes": ["elm"],
+      "rootPatterns": ["elm.json"],
+      "initializationOptions": {
+        "runtime": "node",
+        "elmPath": "elm",
+        "elmFormatPath": "elm-format",
+        "elmTestPath": "elm-test"
+      }
+    }
     //"rust": {
       //"command": "ra_lsp_server",
       //"filetypes": ["rust"],
       //"rootPatterns": ["Cargo.toml"]
+      //},
+      //"haskell": {
+        //"command": "hie-wrapper",
+        //"rootPatterns": [".stack.yaml", "cabal.config", "package.yaml"],
+        //"filetypes": ["hs", "lhs", "haskell"],
+        //"initializationOptions": {},
+        //"settings": {
+          //"languageServerHaskell": {
+            //"hlintOn": false,
+            //"maxNumberOfProblems": 10,
+            //"completionSnippetsOn": true
             //}
-//}
+            //}
+            //}
+  }
+}