Update dependency tslib to v2

Author: renovate-bot

package.json

@@ -77,7 +77,7 @@
   },
   "dependencies": {
     "spruce": "^1.0.3",
-    "tslib": "^1.8.0"
+    "tslib": "2.4.0"
   },
   "devDependencies": {
     "@types/node": "^8.0.47",

yarn.lock

@@ -3403,7 +3403,12 @@ 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:
+[email protected]:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.4.0.tgz#7cecaa7f073ce680a05847aa77be941098f36dc3"
+  integrity sha512-d6xOpEDfsi2CZVlPQzGeux8XMwLT9hssAsaPYExaQMuYskwb+x1x7J371tWlbBdWHroy99KnVB6qIkUbs5X3UQ==
+
+tslib@^1.0.0, tslib@^1.7.1:
   version "1.8.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.8.0.tgz#dc604ebad64bcbf696d613da6c954aa0e7ea1eb6"