Travis: Do not build w/ 3.1 on Trusty

... ZeeQL crashes swiftc.

Author: helje5

.travis.yml

@@ -9,10 +9,10 @@ matrix:
           dist: trusty
           env:  MOD_SWIFT="https://github.com/modswift/mod_swift/archive/0.8.0.tar.gz" SWIFT_SNAPSHOT_NAME="https://swift.org/builds/swift-3.0.2-release/ubuntu1404/swift-3.0.2-RELEASE/swift-3.0.2-RELEASE-ubuntu14.04.tar.gz"
           sudo: required
-        - os:   Linux
-          dist: trusty
-          env:  MOD_SWIFT="https://github.com/modswift/mod_swift/archive/0.8.0.tar.gz" SWIFT_SNAPSHOT_NAME="https://swift.org/builds/swift-3.1.1-release/ubuntu1404/swift-3.1.1-RELEASE/swift-3.1.1-RELEASE-ubuntu14.04.tar.gz"
-          sudo: required
+#        - os:   Linux
+#          dist: trusty
+#          env:  MOD_SWIFT="https://github.com/modswift/mod_swift/archive/0.8.0.tar.gz" SWIFT_SNAPSHOT_NAME="https://swift.org/builds/swift-3.1.1-release/ubuntu1404/swift-3.1.1-RELEASE/swift-3.1.1-RELEASE-ubuntu14.04.tar.gz"
+#          sudo: required
         - os:   osx
           osx_image: xcode8.2