chore(travis): fix travis config

.travis.yml

@@ -5,10 +5,12 @@ go:
 
 
 before_install:
+  - sudo apt-get -qq update
+  - sudo apt-get install -y openvpn
   - go get -t -v ./...
 
 script:
-  - go test -race -coverprofile=coverage.txt -covermode=atomic ./collection
+  - go test -race -coverprofile=coverage.txt -covermode=atomic .
 
 after_success:
 - bash <(curl -s https://codecov.io/bash)