chore(deps): update dependency typescript to v3

Author: renovate-bot

package.json

@@ -15,7 +15,7 @@
   },
   "devDependencies": {
     "ajv-cli": "2.1.0",
-    "typescript": "2.6.2"
+    "typescript": "3.1.3"
   },
   "repository": {
     "type": "git",

yarn.lock

@@ -200,9 +200,9 @@ sigmund@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/sigmund/-/sigmund-1.0.1.tgz#3ff21f198cad2175f9f3b781853fd94d0d19b590"
 
-typescript@2.6.2:
-  version "2.6.2"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.6.2.tgz#3c5b6fd7f6de0914269027f03c0946758f7673a4"
+typescript@3.1.3:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.3.tgz#01b70247a6d3c2467f70c45795ef5ea18ce191d5"
 
 wrappy@1:
   version "1.0.2"