"taskName" changed to "label" as per version 2.0.0 (#1713)

Reference Link: https://code.visualstudio.com/docs/editor/tasks#_migrating-to-tasks-200

Author: shubhambhattar

Code Samples/SampleClangProject/.vscode/tasks.json

@@ -4,7 +4,7 @@
     "version": "2.0.0",
     "tasks": [
         {
-            "taskName": "clang++",
+            "label": "clang++",
             "command": "clang++ --debug -o main.exe main.cpp",
                 // "--debug" enables debugging symbols
                 // "-o main.exe" specifies the output executable
@@ -16,4 +16,4 @@
             }
         }
     ]
-}
+}