Change name of AgreeToTos to AgreeToTOS.

According to https://github.com/golang/go/wiki/CodeReviewComments#initialisms

README.md

@@ -41,17 +41,17 @@ NAME:
 
 USAGE:
    ./lego [global options] command [command options] [arguments...]
-   
+
 VERSION:
    0.0.2
-   
+
 COMMANDS:
    run		Register an account, then create and install a certificate
    auth		Create a certificate - must already have an account
    revoke	Revoke a certificate
    renew	Renew a certificate
    help, h	Shows a list of commands or help for one command
-   
+
 GLOBAL OPTIONS:
    --domains, -d [--domains option --domains option]			Add domains to the process
    --server, -s "https://acme-staging.api.letsencrypt.org/"		CA hostname (and optionally :port). The server certificate must be trusted in order to avoid further modifications to the client.
@@ -112,7 +112,7 @@ myUser.Registration = reg
 
 // The client has a URL to the current Let's Encrypt Subscriber
 // Agreement. The user will need to agree to it.
-err = client.AgreeToTos()
+err = client.AgreeToTOS()
 if err != nil {
 	log.Fatal(err)
 }

acme/client.go

@@ -131,9 +131,9 @@ func (c *Client) Register() (*RegistrationResource, error) {
 	return reg, nil
 }
 
-// AgreeToTos updates the Client registration and sends the agreement to
+// AgreeToTOS updates the Client registration and sends the agreement to
 // the server.
-func (c *Client) AgreeToTos() error {
+func (c *Client) AgreeToTOS() error {
 	c.user.GetRegistration().Body.Agreement = c.user.GetRegistration().TosURL
 	c.user.GetRegistration().Body.Resource = "reg"
 	jsonBytes, err := json.Marshal(&c.user.GetRegistration().Body)