Travis: Use mod_swift 0.9.0

Maybe that fixes the issue.

Author: helje5

.gitignore

@@ -83,4 +83,5 @@ Packages
 
 Package.pins
 Package.resolved
+.linux-build
 

.travis.yml

@@ -8,11 +8,11 @@ matrix:
     include:
         - os:   Linux
           dist: trusty
-          env:  MOD_SWIFT="https://github.com/modswift/mod_swift/archive/0.8.11.tar.gz" SWIFT_SNAPSHOT_NAME="https://swift.org/builds/swift-4.2.3-release/ubuntu1404/swift-4.2.3-RELEASE/swift-4.2.3-RELEASE-ubuntu14.04.tar.gz"
+          env:  MOD_SWIFT="https://github.com/modswift/mod_swift/archive/0.9.0.tar.gz" SWIFT_SNAPSHOT_NAME="https://swift.org/builds/swift-4.2.3-release/ubuntu1404/swift-4.2.3-RELEASE/swift-4.2.3-RELEASE-ubuntu14.04.tar.gz"
           sudo: required
         - os:   Linux
           dist: trusty
-          env:  MOD_SWIFT="https://github.com/modswift/mod_swift/archive/0.8.11.tar.gz" SWIFT_SNAPSHOT_NAME="https://swift.org/builds/swift-5.0.2-release/ubuntu1404/swift-5.0.2-RELEASE/swift-5.0.2-RELEASE-ubuntu14.04.tar.gz"
+          env:  MOD_SWIFT="https://github.com/modswift/mod_swift/archive/0.9.0.tar.gz" SWIFT_SNAPSHOT_NAME="https://swift.org/builds/swift-5.0.2-release/ubuntu1404/swift-5.0.2-RELEASE/swift-5.0.2-RELEASE-ubuntu14.04.tar.gz"
           sudo: required
         - os:   osx
           osx_image: xcode10.2