Update dependency typescript to ^3.4.5

Author: renovate-bot

package.json

@@ -149,7 +149,7 @@
     "parcel-bundler": "^1.11.0",
     "sourcegraph": "^23.0.0",
     "tslint": "^5.15.0",
-    "typescript": "^3.1.6"
+    "typescript": "^3.4.5"
   },
   "dependencies": {
     "@sourcegraph/basic-code-intel": "6.0.16",

yarn.lock

@@ -5487,10 +5487,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@^3.1.6:
-  version "3.3.3333"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.3.3333.tgz#171b2c5af66c59e9431199117a3bcadc66fdcfd6"
-  integrity sha512-JjSKsAfuHBE/fB2oZ8NxtRTk5iGcg6hkYXMnZ3Wc+b2RSqejEqTaem11mHASMnFilHrax3sLK0GDzcJrekZYLw==
+typescript@^3.4.5:
+  version "3.4.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.5.tgz#2d2618d10bb566572b8d7aad5180d84257d70a99"
+  integrity sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw==
 
 unicode-canonical-property-names-ecmascript@^1.0.4:
   version "1.0.4"