feat: improves code coverage, removes assert functionality

Author: IAmRadek

README.md

@@ -42,16 +42,6 @@ type HTTPServer struct {
 	Headers map[string]string `env:"HEADERS"` // "k1=v1,k2=v2"
 }
 
-func (cfg HTTPServer) Validate() error {
-	return envconfig.Assert(
-		envconfig.OneOf(cfg.Env, "ENV", "production", "prod"),
-		envconfig.Not(
-			envconfig.Range(cfg.Port, 0, 1023, "PORT"),
-			"PORT: must not be a reserved port (0-1023)",
-		),
-	)
-}
-
 func main() {
 	var cfg HTTPServer