Update dependency typescript to v3.9.8

Author: renovate-bot

package.json

@@ -38,7 +38,7 @@
     "standard": "10.0.3",
     "ts-jest": "22.4.4",
     "tslint": "5.9.1",
-    "typescript": "3.0.3"
+    "typescript": "3.9.8"
   },
   "keywords": [
     "bot",

yarn.lock

@@ -4382,9 +4382,10 @@ typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
-[email protected]:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.0.3.tgz#4853b3e275ecdaa27f78fda46dc273a7eb7fc1c8"
+[email protected]:
+  version "3.9.8"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.8.tgz#7d937ba4e4044af7fa83d127b982f8f61ca816a4"
+  integrity sha512-nDbnFkUZZjkQ92qwKX+C+jtk4OGfU8H9toSEs3uAsl8cxLjG2sqQm6leF/pLWvm9FAEJ6KHkYMAbHYaY2ITeVg==
 
 uglify-js@^2.6:
   version "2.8.29"