(GH-337) Update vscode-languageclient to 4.4.0

This commit updates the vscode-languageclient node module to 4.4.0.  This is
needed for more recent LSP features.

Author: glennsarti

package-lock.json

@@ -443,7 +443,7 @@
     "gulp-decompress": "^2.0.2"
   },
   "dependencies": {
-    "vscode-languageclient": "3.3.0",
+    "vscode-languageclient": "4.4.0",
     "vscode-extension-telemetry": "^0.0.15",
     "viz.js": "~1.7.0",
     "vscode-debugprotocol": "^1.19.0",

package.json

@@ -2,7 +2,8 @@ import { ConnectionStatus } from "./interfaces";
 import { LanguageClient } from "vscode-languageclient/lib/main";
 import { PuppetStatusBar } from "./PuppetStatusBar";
 import { ILogger } from "./logging";
-import { ServerOptions, LanguageClientOptions } from "vscode-languageclient/lib/client";
+import { LanguageClientOptions } from "vscode-languageclient/lib/client";
+import { ServerOptions } from "vscode-languageclient";
 import { PuppetVersionDetails, PuppetVersionRequest } from "./messages";
 import { ConnectionManager } from "./connection";