Adds swift install back - fixes build

ci/update.sh

@@ -15,6 +15,39 @@
 # limitations under the License.
 ##
 
+osName="linux"
+if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then osName="osx"; fi
+export osName
+export projectFolder=`pwd`
+projectName="$(basename $projectFolder)"
+export SWIFT_SNAPSHOT=swift-4.0
+sudo apt-get -qq update > /dev/null
+sudo apt-get -y -qq install clang lldb-3.8 libicu-dev libtool libcurl4-openssl-dev libbsd-dev build-essential libssl-dev uuid-dev tzdata libz-dev > /dev/null
+
+# Environment vars
+version=`lsb_release -d | awk '{print tolower($2) $3}'`
+export UBUNTU_VERSION=`echo $version | awk -F. '{print $1"."$2}'`
+export UBUNTU_VERSION_NO_DOTS=`echo $version | awk -F. '{print $1$2}'`
+
+if [[ ${SWIFT_SNAPSHOT} =~ ^.*RELEASE.*$ ]]; then
+        SNAPSHOT_TYPE=$(echo "$SWIFT_SNAPSHOT" | tr '[:upper:]' '[:lower:]')
+elif [[ ${SWIFT_SNAPSHOT} =~ ^swift-.*-DEVELOPMENT.*$ ]]; then
+  SNAPSHOT_TYPE=${SWIFT_SNAPSHOT%-DEVELOPMENT*}-branch
+elif [[ ${SWIFT_SNAPSHOT} =~ ^.*DEVELOPMENT.*$ ]]; then
+        SNAPSHOT_TYPE=development
+else
+        SNAPSHOT_TYPE="$(echo "$SWIFT_SNAPSHOT" | tr '[:upper:]' '[:lower:]')-release"
+  SWIFT_SNAPSHOT="${SWIFT_SNAPSHOT}-RELEASE"
+fi
+
+echo ">> Installing '${SWIFT_SNAPSHOT}'..."
+# Install Swift compiler
+cd $projectFolder
+wget https://swift.org/builds/$SNAPSHOT_TYPE/$UBUNTU_VERSION_NO_DOTS/$SWIFT_SNAPSHOT/$SWIFT_SNAPSHOT-$UBUNTU_VERSION.tar.gz
+tar xzf $SWIFT_SNAPSHOT-$UBUNTU_VERSION.tar.gz
+export PATH=$projectFolder/$SWIFT_SNAPSHOT-$UBUNTU_VERSION/usr/bin:$PATH
+rm $SWIFT_SNAPSHOT-$UBUNTU_VERSION.tar.gz
+
 # Actions after Swift installation
 
 git remote rm origin