Remove unused dependency (callsite)

Author: bradlc

package-lock.json

@@ -245,7 +245,6 @@
     "@types/node": "^13.9.3",
     "@types/vscode": "^1.32.0",
     "@zeit/ncc": "^0.22.0",
-    "callsite": "^1.0.0",
     "chokidar": "^3.3.1",
     "clear-module": "^4.1.1",
     "concurrently": "^5.1.0",