Update travis to go 1.9

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 go:
     #- 1.7.x
-    - 1.8.x
+    - 1.9.x
       # - tip
 
 # we have everything vendored

ci/bintray.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-go version |grep go1.8 || exit
+go version |grep go1.9 || exit
 VERSION=$(git describe --tags)
 mkdir ci/binaries
 GOOS=windows GOARCH=amd64 go build -ldflags "-s -w -X main.githash=$(git log --pretty=format:'%h' -n 1)" -o ci/binaries/matterbridge-$VERSION-win64.exe