update swift-tools-support-core version

Author: xihui-wu

utils/update_checkout/update-checkout-config.json

@@ -346,7 +346,7 @@
                 "swift": "tensorflow",
                 "cmark": "swift-DEVELOPMENT-SNAPSHOT-2020-11-09-a",
                 "llbuild": "swift-DEVELOPMENT-SNAPSHOT-2020-11-09-a",
-                "swift-tools-support-core": "0.1.8",
+                "swift-tools-support-core": "swift-DEVELOPMENT-SNAPSHOT-2020-11-09-a",
                 "swiftpm": "swift-DEVELOPMENT-SNAPSHOT-2020-11-09-a",
                 "swift-argument-parser": "0.3.1",
                 "swift-driver": "swift-DEVELOPMENT-SNAPSHOT-2020-11-09-a",