Update dependency @types/jest to v20.0.8

Author: renovate-bot

packages/client/package.json

@@ -48,7 +48,7 @@
   "author": "Tim Mikeladze",
   "license": "MIT",
   "devDependencies": {
-    "@types/jest": "20.0.2",
+    "@types/jest": "20.0.8",
     "jest": "20.0.4",
     "jsonwebtoken": "7.4.1",
     "lerna": "2.0.0-beta.32",

packages/client/yarn.lock

@@ -2,9 +2,9 @@
 # yarn lockfile v1
 
 
-"@types/[email protected].2":
-  version "20.0.2"
-  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-20.0.2.tgz#86c751121fb53dbd39bb1a08c45083da13f2dc67"
+"@types/[email protected].8":
+  version "20.0.8"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-20.0.8.tgz#7f8c97f73d20d3bf5448fbe33661a342002b5954"
 
 abab@^1.0.3:
   version "1.0.3"