Sync up with rescript-editor-support c57ed6d (#94)

Sync up with rescript-lang/rescript-editor-support@c57ed6d

#### New features
- Add support for autocomplete for pipe-first `foo->`: the type of `foo` is used to determine the module to take completions from.
- Add support for autocomplete for decorators such as `@module` and `@val`.
- Add support for autocomplete of labelled arguments `foo(~label... )`.

#### Fixes

- Fix issue for uncurried functions where the internal definition of `Js.Fn.arity` is shown on hover. (See rescript-lang/rescript-editor-support#62).
- Fix type hint when hovering over labeled arguments of components (See rescript-lang/rescript-editor-support#63).
- Fix issue where values declared with type annotation would not show up in autocomplete, and would show no doc comment on hover. (See #72).
- Fix hover on definitions inside a react component module, or whenever multiple definitins for the same value exist in the module (See rescript-lang/rescript-editor-support#67).
- Fix autocomplete issue where multiple open's were considered in the wrong priority order (See rescript-lang/rescript-editor-support#72).

Author: cristianoc

server/darwin/rescript-editor-support.exe

@@ -280,7 +280,7 @@ process.on("message", (msg: m.Message) => {
           hoverProvider: binaryExists,
           definitionProvider: binaryExists,
           completionProvider: binaryExists
-            ? { triggerCharacters: ["."] }
+            ? { triggerCharacters: [".", ">", "@", "~"] }
             : undefined,
         },
       };