Merge pull request swiftlang#189 from groue/pr_GRDB_4.1

Add GRDB + Swift 4.1

Author: Zachary 'Clack' Cole

projects.json

@@ -636,6 +636,10 @@
     "path": "GRDB.swift",
     "branch": "master",
     "compatibility": [
+      {
+        "version": "4.1",
+        "commit": "27e94c211d1e6b129ecfa9e73d5846717ceed4e8"
+      },
       {
         "version": "4.0",
         "commit": "58e05d13d1e5b42c70c6dd36d64cf1a44fabbb45"