lint: fix all major issues

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

util/pool/options.go

@@ -6,26 +6,31 @@ import (
 	"github.com/unistack-org/micro/v3/network/transport"
 )
 
+// Options struct
 type Options struct {
 	Transport transport.Transport
 	TTL       time.Duration
 	Size      int
 }
 
+// Option func signature
 type Option func(*Options)
 
+// Size sets the size
 func Size(i int) Option {
 	return func(o *Options) {
 		o.Size = i
 	}
 }
 
+// Transport sets the transport
 func Transport(t transport.Transport) Option {
 	return func(o *Options) {
 		o.Transport = t
 	}
 }
 
+// TTL specifies ttl
 func TTL(t time.Duration) Option {
 	return func(o *Options) {
 		o.TTL = t

util/pool/pool.go

@@ -18,6 +18,7 @@ type Pool interface {
 	Release(c Conn, status error) error
 }
 
+// Conn conn pool interface
 type Conn interface {
 	// unique id of connection
 	Id() string
@@ -27,8 +28,9 @@ type Conn interface {
 	transport.Client
 }
 
+// NewPool creates new connection pool
 func NewPool(opts ...Option) Pool {
-	var options Options
+	options := Options{}
 	for _, o := range opts {
 		o(&options)
 	}