Address various linter complains · ksysoev/wsget@ac956b3

golangci-lint: pkg/cli/cli.go#L52

Error return value of `c.history.SaveToFile` is not checked (errcheck)

golangci-lint: pkg/cli/history.go#L23

Error return value of `h.loadFromFile` is not checked (errcheck)

golangci-lint: pkg/cli/cli.go#L148

emptyStringTest: replace `len(buffer) == 0` with `buffer == ""` (gocritic)

golangci-lint: pkg/cli/cli.go#L64

whyNoLint: include an explanation for nolint directive (gocritic)

golangci-lint: pkg/cli/cli.go#L123

whyNoLint: include an explanation for nolint directive (gocritic)

golangci-lint: pkg/cli/history.go#L29

octalLiteral: use new octal literal style, 0o644 (gocritic)

golangci-lint: pkg/cli/history.go#L60

octalLiteral: use new octal literal style, 0o644 (gocritic)

golangci-lint: cmd/wsget/main.go#L67

exitAfterDefer: log.Fatal will exit, and `defer wsInsp.Close()` will not run (gocritic)

golangci-lint: pkg/ws/ws.go#L44

only one cuddle assignment allowed before if statement (wsl)

golangci-lint: pkg/cli/cli.go#L38

assignments should only be cuddled with other assignments (wsl)

golangci-lint: pkg/ws/ws.go#L26

exported: type name will be used as ws.WSConnection by other packages, and that stutters; consider calling this Connection (revive)

golangci-lint: pkg/ws/ws.go#L18

var-naming: don't use ALL_CAPS in Go names; use CamelCase (revive)

golangci-lint: pkg/formater/formater.go#L69

var-naming: method formatJsonMessage should be formatJSONMessage (revive)

golangci-lint: pkg/formater/formater.go#L84

var-naming: method parseJson should be parseJSON (revive)

golangci-lint: pkg/formater/json.go#L11

var-naming: type JsonFormater should be JSONFormater (revive)

golangci-lint: pkg/formater/json.go#L17

var-naming: func NewJsonFormater should be NewJSONFormater (revive)

golangci-lint: pkg/cli/cli.go#L16

var-naming: don't use ALL_CAPS in Go names; use CamelCase (revive)

golangci-lint: pkg/cli/cli.go#L17

var-naming: don't use ALL_CAPS in Go names; use CamelCase (revive)

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