Merge pull request swiftlang#242 from apple/update-then

Update Then hash to build against 4.2

Author: Zachary 'Clack' Cole

projects.json

@@ -2438,8 +2438,8 @@
     "maintainer": "[email protected]",
     "compatibility": [
       {
-        "version": "3.1",
-        "commit": "daaea1ac2100ae86bd20f0920ebbd2f1becb2e6e"
+        "version": "4.2",
+        "commit": "3edb1c0f557506d845362fda6d8564718435bfb1"
       }
     ],
     "platforms": [
@@ -2449,16 +2449,7 @@
       {
         "action": "BuildSwiftPackage",
         "configuration": "release",
-        "tags": "sourcekit",
-        "xfail": {
-          "compatibility": {
-            "3.1": {
-              "branch": {
-                "master": "https://bugs.swift.org/browse/SR-8250"
-              }
-            }
-          }
-        }
+        "tags": "sourcekit"
       },
       {
         "action": "TestSwiftPackage"