README.md in acme-client-0.1.1 vs README.md in acme-client-0.1.2

@@ -1,21 +1,21 @@
 # Acme::Client
 
 `acme-client` is a client implementation of the [ACME](https://letsencrypt.github.io/acme-spec) protocol in Ruby.
 
-You can find the server reference implementation for ACME server [here](github.com/letsencrypt/boulder) and also the a reference [client](github.com/letsencrypt/letsencrypt) in python.
+You can find the server reference implementation for ACME server [here](https://github.com/letsencrypt/boulder) and also the a reference [client](https://github.com/letsencrypt/letsencrypt) in python.
 
 ACME is part of the [Letsencrypt](https://letsencrypt.org/) project, that are working hard at encrypting all the things.
 
 ## Usage
 
 ```ruby
 # We're going to need a private key.
 private_key = OpenSSL::PKey::RSA.new(2048)
 
 # We need an ACME server to talk to, see github.com/letsencrypt/boulder
-endpoint = 'http://letsencrypt.com/'
+endpoint = 'https://acme-staging.api.letsencrypt.org'
 
 # Initialize the client
 client = Acme::Client.new(private_key: private_key, endpoint: endpoint)
 
 # If the private key is not known to the server, we need to register it for the first time.
@@ -24,11 +24,11 @@
 # You'll may need to agree to the term (that's up the to the server to require it or not but boulder does by default)
 registration.agree_terms
 
 # Let's try to optain a certificate for yourdomain.com
 
-# We need to prove that we control the domain using one of the challanges method.
+# We need to prove that we control the domain using one of the challenges method.
 authorization = client.authorize(domain: 'yourdomain.com')
 
 # For now the only challenge method supprted by the client is simple_http.
 simple_http = authorization.simple_http
 
@@ -62,10 +62,10 @@
 csr.subject = OpenSSL::X509::Name.new([
   ['CN', common_name, OpenSSL::ASN1::UTF8STRING]
 ])
 
 csr.public_key = certificate_private_key.public_key
-csr.sign(private_key, OpenSSL::Digest::SHA256.new)
+csr.sign(certificate_private_key, OpenSSL::Digest::SHA256.new)
 
 # We can now request a certificate
 client.new_certificate(csr) # => #<OpenSSL::X509::Certificate ....>
 ```