chore: update typescript

This updates to the latest typescript version. I am mainly interested in taking advantage of the new [Optional Chaining](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#optional-chaining) feature to write more concise code when making nullish checks.
ExchangeUnion · Feb 24, 2020 · 1828139 · 1828139
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commit 1828139
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diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
diff --git a/package.json b/package.json
@@ -198,7 +198,7 @@
     "tslint-config-airbnb": "^5.11.2",
     "tslint-no-circular-imports": "^0.7.0",
     "typedoc": "^0.15.0",
-    "typescript": "^3.6.4"
+    "typescript": "^3.8.2"
   },
   "engines": {
     "node": ">=10.2.0"