Update dependency tslib to v2

Author: renovate[bot]

package.json

@@ -77,7 +77,7 @@
   },
   "dependencies": {
     "spruce": "^1.0.3",
-    "tslib": "^1.8.0"
+    "tslib": "^2.0.0"
   },
   "devDependencies": {
     "@types/node": "^8.0.47",

yarn.lock

@@ -3403,10 +3403,15 @@ tsconfig@^6.0.0:
     strip-bom "^3.0.0"
     strip-json-comments "^2.0.0"
 
-tslib@^1.0.0, tslib@^1.7.1, tslib@^1.8.0:
+tslib@^1.0.0, tslib@^1.7.1:
   version "1.8.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.8.0.tgz#dc604ebad64bcbf696d613da6c954aa0e7ea1eb6"
 
+tslib@^2.0.0:
+  version "2.8.1"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.8.1.tgz#612efe4ed235d567e8aba5f2a5fab70280ade83f"
+  integrity sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==
+
 tslint-config-standard@^7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/tslint-config-standard/-/tslint-config-standard-7.0.0.tgz#47bbf25578ed2212456f892d51e1abe884a29f15"