Merge pull request #198 from tkremenek/Dwifft-4.0

Update hash for Dwifft to build with SWIFT_VERSION=4.0

Author: Zachary 'Clack' Cole

projects.json

@@ -605,12 +605,8 @@
     "maintainer": "[email protected]",
     "compatibility": [
       {
-        "version": "3.0",
-        "commit": "e3e8bf0d2355a23dc0f1af3a0b6465efcb3b6488"
-      },
-      {
-        "version": "3.1",
-        "commit": "e3e8bf0d2355a23dc0f1af3a0b6465efcb3b6488"
+        "version": "4.0",
+        "commit": "6e09d221d6589c6f620af810727cfb6a2657d911"
       }
     ],
     "platforms": [