Update documents

README.md

@@ -49,7 +49,7 @@ Task queues are used as a mechanism to distribute work across multiple machines.
 
 ## Quickstart
 
-Make sure you have Go installed ([download](https://golang.org/dl/)). Version `1.13` or higher is required.
+Make sure you have Go installed ([download](https://golang.org/dl/)). Version `1.14` or higher is required.
 
 Initialize your project by creating a folder and then running `go mod init github.com/your/repo` ([learn more](https://blog.golang.org/using-go-modules)) inside the folder. Then install Asynq library with the [`go get`](https://golang.org/cmd/go/#hdr-Add_dependencies_to_current_module_and_install_them) command:
 

asynq.go

@@ -82,10 +82,10 @@ type TaskInfo struct {
 	// zero if not applicable.
 	NextProcessAt time.Time
 
-	// ResulTTL is the retention period after the task is successfully processed.
+	// ResulTTL is duration of the retention period after the task is successfully processed.
 	ResultTTL time.Duration
 
-	// CompletedAt is the time the task is processed successfully.
+	// CompletedAt is the time when the task is processed successfully.
 	// Zero value (i.e. time.Time{}) indicates no value.
 	CompletedAt time.Time
 

client.go

@@ -180,7 +180,7 @@ func (d processInOption) String() string     { return fmt.Sprintf("ProcessIn(%v)
 func (d processInOption) Type() OptionType   { return ProcessInOpt }
 func (d processInOption) Value() interface{} { return time.Duration(d) }
 
-// ResultTTL returns an option to specify the retention period for the task.
+// ResultTTL returns an option to specify the duration of retention period for the task.
 // If this option is provided, the task will be stored as a completed task after successful processing.
 // A completed task will be deleted after the TTL expires.
 func ResultTTL(ttl time.Duration) Option {