travis: run mage with -v to not discard output

Before this:

    $ go run mage.go lint
    Error: running "/Users/sebastiaan/go/bin/golangci-lint run ./..." failed with exit code 1
    exit status 1

    $ go run mage.go test
    Error: running "go test -race -v ./..." failed with exit code 1
    exit status 1

After this:

    $ go run mage.go -v lint
    Running target: Lint
    exec: /Users/sebastiaan/go/bin/golangci-lint run ./...
    entry.go:89:6: `iamNotUsed` is unused (deadcode)
    func iamNotUsed() {
         ^
    Error: running "/Users/sebastiaan/go/bin/golangci-lint run ./..." failed with exit code 1
    exit status 1

    $ go run mage.go -v test
    Running target: Test
    exec: go test -race -v ./...
    === RUN   TestRegister
    ...
    ?   	github.com/sirupsen/logrus/internal/testutils	[no test files]
    FAIL
    Error: running "go test -race -v ./..." failed with exit code 1
    exit status 1

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.travis.yml

@@ -10,5 +10,5 @@ install:
   - ./travis/install.sh
 script:
   - go run mage.go -v crossBuild
-  - go run mage.go lint
+  - go run mage.go -v lint
-  - go run mage.go test
+  - go run mage.go -v test