Switch to go mod and update some dependencies

- Update Travis Go version to 1.12
- Convert Sirupsen/logrus to sirupsen/logrus

Author: mihaitodor

.travis.yml

@@ -1,14 +1,16 @@
 language: go
 go:
-  - 1.8.x
+  - 1.12.x
 
 sudo: required
 
 services:
   - docker
 
-install:
-  - go get github.com/golang/dep/cmd/dep && dep ensure
+env:
+  - GO111MODULE=on GOFLAGS=-mod=vendor
+
+install: true
 
 script:
   - go test -v ./... && (CGO_ENABLED=0 GOOS=linux go build -ldflags '-d')