Update typescript target level to improve stack traces

[phiresky]

diff --git a/tsconfig.json b/tsconfig.json
index d9c7f76..c127552 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,7 +6,7 @@
     "noImplicitAny": true,
     "lib": ["es2017", "es7", "es6", "dom"],
     "outDir": "./dist",
-    "target": "ES2015",
+    "target": "ES2020",
     "experimentalDecorators": true,
     "strictNullChecks": true,
     "moduleResolution": "Node",

before:

Not Found

  964 |         }
  965 |         catch (_b) {
> 966 |             throw new Error(response.statusText);
      |                   ^
  967 |         }
  968 |         if (!response.ok) {
  969 |             throw new Error((_a = json["error"]) !== null && _a !== void 0 ? _a : response.statusText);

  at LemmyHttp.<anonymous> (../../lemmy-js-client/dist/http.js:966:19)
      at Generator.throw (<anonymous>)
  at rejected (../../lemmy-js-client/dist/http.js:15:65)

after

Not Found

  938 |     }
  939 |     catch {
> 940 |         throw new Error(response.statusText);
      |               ^
  941 |     }
  942 |     if (!response.ok) {
  943 |         throw new Error(json["error"] ?? response.statusText);

  at LemmyHttp._LemmyHttp_wrapper (../../lemmy-js-client/dist/http.js:940:15)
  at Object.<anonymous> (src/tags.spec.ts:150:16)

note the actual source location src/tags.spec.ts:150:16 is present after but not before

if compat is important even es2017 as target should fix this

[dessalines]

Could you open a PR for this? thx.

EDIT: nm, I see you have it in your other PR.