[Travis] Change Swift 4 snapshot to '2017-07-26-a'

Running `swift test` causes issues in '2017-07-27-a'.
nvzqz · Jul 28, 2017 · 9ee7e0d · 9ee7e0d
1 parent aa0b305
commit 9ee7e0d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -29,7 +29,7 @@ matrix:
       sudo: required
       dist: trusty
       env:
-        - SWIFT_VERSION="4.0-DEVELOPMENT-SNAPSHOT-2017-07-27-a"
+        - SWIFT_VERSION="4.0-DEVELOPMENT-SNAPSHOT-2017-07-26-a"
 env:
   global:
     - LC_CTYPE=en_US.UTF-8