chore: unpin version of gts (#192)

Author: JustinBeckwith

core/projectify/package.json

@@ -34,7 +34,7 @@
     "@types/mocha": "^7.0.2",
     "@types/node": "^10.17.17",
     "codecov": "^3.6.5",
-    "gts": "2.0.0",
+    "gts": "^2.0.0",
     "mocha": "^7.1.1",
     "c8": "^7.1.0",
     "typescript": "3.8.3",