The build doesn't run tests

[rbruggem]

Furthermore, tests fail when run locally with clickhouse installed

--- FAIL: TestPrepareExecPostRequest (0.00s)
        Error Trace:    transport_test.go:69
        Error:          Not equal: 
                        expected: <nil>(<nil>)
                        actual  : *url.Error(&url.Error{Op:"parse", URL:"127.0.0.0:8123", Err:(*errors.errorString)(0xc420112600)})
        Test:           TestPrepareExecPostRequest
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x40 pc=0x68e622]

goroutine 63 [running]:
testing.tRunner.func1(0xc4201244e0)
        /usr/lib/go-1.8/src/testing/testing.go:622 +0x29d
panic(0x6da460, 0x899fc0)
        /usr/lib/go-1.8/src/runtime/panic.go:489 +0x2cf
github.com/roistat/go-clickhouse.TestPrepareExecPostRequest(0xc4201244e0)
        /home/dude/go/src/github.com/roistat/go-clickhouse/transport_test.go:70 +0x132
testing.tRunner(0xc4201244e0, 0x744670)
        /usr/lib/go-1.8/src/testing/testing.go:657 +0x96
created by testing.(*T).Run
        /usr/lib/go-1.8/src/testing/testing.go:697 +0x2ca
FAIL    github.com/roistat/go-clickhouse        0.027s