Update triggerCharacters to support parameter expansions

Author: skovhus

server/src/__tests__/__snapshots__/server.test.ts.snap

@@ -4,6 +4,10 @@ exports[`server initializes and responds to capabilities 1`] = `
 Object {
   "completionProvider": Object {
     "resolveProvider": true,
+    "triggerCharacters": Array [
+      "$",
+      "{",
+    ],
   },
   "definitionProvider": true,
   "documentHighlightProvider": true,

server/src/server.ts

@@ -100,6 +100,7 @@ export default class BashServer {
       textDocumentSync: LSP.TextDocumentSyncKind.Full,
       completionProvider: {
         resolveProvider: true,
+        triggerCharacters: ['$', '{'],
       },
       hoverProvider: true,
       documentHighlightProvider: true,