Stop language client after disposing

I think this may fix an issue where the "TypeScript Language Server
stopped unexpectedly" message is shown when it shouldn't.

It's not testable locally apparently - I submitted feedback to Panic
about this.

Author: apexskier

src/main.ts

@@ -293,6 +293,7 @@ export function activate() {
 }
 
 export function deactivate() {
-  client?.stop();
+  console.log("deactivate");
   compositeDisposable.dispose();
+  client?.stop();
 }