chore: add linter to CI

[estensen]

Merge after lints are fixed

➜  fiber-go git:(lint) ✗ golangci-lint run
client.go:175:10: Error return value of `c.Close` is not checked (errcheck)
                c.Close()
                       ^
client.go:181:10: Error return value of `c.Close` is not checked (errcheck)
                c.Close()
                       ^
client.go:187:10: Error return value of `c.Close` is not checked (errcheck)
                c.Close()
                       ^
client_test.go:35:22: Error return value of `client.Close` is not checked (errcheck)
                        defer client.Close()
                                          ^
reconnection_test.go:38:19: Error return value of `fiber.Close` is not checked (errcheck)
        defer fiber.Close()
                         ^
reconnection_test.go:91:18: Error return value of `fiber.conn.Close` is not checked (errcheck)
        fiber.conn.Close()
                        ^
compression.go:51:4: QF1008: could remove embedded field "Writer" from selector (staticcheck)
        z.Writer.Reset(w)
          ^
7 issues:
* errcheck: 6
* staticcheck: 1

[estensen]

These address the linter fails
#30
#31