store: Move initialize type next to initializers.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

pkg/store/store.go

@@ -22,9 +22,6 @@ const (
 // and is triggered on key change
 type WatchCallback func(entries ...*KVPair)
 
-// Initialize creates a new Store object, initializing the client
-type Initialize func(addrs []string, options *Config) (Store, error)
-
 // Store represents the backend K/V storage
 // Each store should support every call listed
 // here. Or it couldn't be implemented as a K/V
@@ -86,6 +83,9 @@ type Locker interface {
 	Unlock() error
 }
 
+// Initialize creates a new Store object, initializing the client
+type Initialize func(addrs []string, options *Config) (Store, error)
+
 var (
 	// Backend initializers
 	initializers = map[Backend]Initialize{