bump to task-lib 2.8.0

Author: bryanmacfarlane

package-lock.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "@types/semver": "^5.3.0",
     "@types/uuid": "^3.0.1",
-    "azure-pipelines-task-lib": "^2.7.1",
+    "azure-pipelines-task-lib": "^2.8.0",
     "semver": "^5.3.0",
     "semver-compare": "^1.0.0",
     "typed-rest-client": "1.0.9",