refactor: remove travis (#41)

.travis.yml

@@ -1,20 +0,0 @@
-sudo: required
-language: go
-
-go:
-  - 1.6.x
-  - 1.7.x
-  - tip
-
-before_install:
-  - sudo useradd -m -d /home/drone-scp -s /bin/bash drone-scp
-  - sudo mkdir -p /home/drone-scp/.ssh
-  - sudo chmod 700 /home/drone-scp/.ssh
-  - sudo cp tests/.ssh/id_rsa.pub /home/drone-scp/.ssh/authorized_keys
-  - sudo chown -R drone-scp /home/drone-scp/.ssh
-
-script:
-  - make vet
-  - make lint
-  - make test
-  - make build