Fix building and passing tests

[xaionaro]

Before

xaionaro@void:~/go/src/github.com/xaionaro-go/logrustash$ go test ./... -test.count=1
pattern ./...: directory prefix . does not contain main module or its selected dependencies
xaionaro@void:~/go/src/github.com/xaionaro-go/logrustash$ go mod init
go: creating new go.mod: module github.com/xaionaro-go/logrustash
go: to add module requirements and sums:
	go mod tidy
xaionaro@void:~/go/src/github.com/xaionaro-go/logrustash$ go mod tidy
go: finding module for package github.com/sirupsen/logrus
go: finding module for package github.com/teh-cmc/goautosocket
go: found github.com/sirupsen/logrus in github.com/sirupsen/logrus v1.9.3
go: finding module for package github.com/teh-cmc/goautosocket
go: github.com/xaionaro-go/logrustash imports
	github.com/teh-cmc/goautosocket: cannot find module providing package github.com/teh-cmc/goautosocket: module github.com/teh-cmc/goautosocket: git ls-remote -q origin in /home/xaionaro/.gvm/pkgsets/go1.22.1/global/pkg/mod/cache/vcs/9b99942761a13c552cfdbd0877837e4cec83bdc7a231c9c0224ba501b36d1e77: exit status 128:
	fatal: could not read Username for 'https://github.com': terminal prompts disabled
Confirm the import path was entered correctly.
If this is a private repository, see https://golang.org/doc/faq#git_https for additional information.
xaionaro@void:~/go/src/github.com/xaionaro-go/logrustash$ sed -e 's/teh-cmc/netbrain/g' -i logstash.go
xaionaro@void:~/go/src/github.com/xaionaro-go/logrustash$ go mod tidy
go: finding module for package github.com/sirupsen/logrus
go: finding module for package github.com/netbrain/goautosocket
go: found github.com/netbrain/goautosocket in github.com/netbrain/goautosocket v0.0.0-20150624145746-bef85f0aef40
go: found github.com/sirupsen/logrus in github.com/sirupsen/logrus v1.9.3
xaionaro@void:~/go/src/github.com/xaionaro-go/logrustash$ go test ./... -test.count=1
--- FAIL: TestLogstashFormatter (0.00s)
    logstash_formatter_test.go:58: expected data[error] to be 'Get http://example.com: The error' but got 'Get "http://example.com": The error'
--- FAIL: TestLogstashHook (0.00s)
    logstash_test.go:90: unknown network udp
    logstash_test.go:93: expected hook to be not nil
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=0x18 pc=0x570f3a]

goroutine 7 [running]:
testing.tRunner.func1.2({0x592f80, 0x711f40})
	/home/xaionaro/.gvm/gos/go1.22.1/src/testing/testing.go:1631 +0x24a
testing.tRunner.func1()
	/home/xaionaro/.gvm/gos/go1.22.1/src/testing/testing.go:1634 +0x377
panic({0x592f80?, 0x711f40?})
	/home/xaionaro/.gvm/gos/go1.22.1/src/runtime/panic.go:770 +0x132
github.com/xaionaro-go/logrustash.TestLogstashHook(0xc0000d0680)
	/home/xaionaro/go/src/github.com/xaionaro-go/logrustash/logstash_test.go:96 +0x55a
testing.tRunner(0xc0000d0680, 0x5d0e90)
	/home/xaionaro/.gvm/gos/go1.22.1/src/testing/testing.go:1689 +0xfb
created by testing.(*T).Run in goroutine 1
	/home/xaionaro/.gvm/gos/go1.22.1/src/testing/testing.go:1742 +0x390
FAIL	github.com/xaionaro-go/logrustash	0.006s
FAIL

After

xaionaro@void:~/go/src/github.com/xaionaro-go/logrustash$ go test ./... -test.count=1
ok  	github.com/xaionaro-go/logrustash	0.005s