bug #1 Update docs to match implementation (iangregory)

This PR was squashed before being merged into the 1.0-dev branch.

Discussion
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Corrects a couple of inconsistencies between the docs/comments and the code

Commits
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ca5f4d4 Update README.md to match implementation
8566f85 Correct usage example in comments

Author: sstok

README.md

@@ -73,7 +73,7 @@ $splitTokenFactory = new Argon2SplitTokenFactory();
 
 // Step 1. Create a new SplitToken for usage
 
-$token = $splitTokenFactory->create();
+$token = $splitTokenFactory->generate();
 
 // The $authToken holds a \ParagonIE\HiddenString\HiddenString to prevent
 // leakage of this value. You need to cast this object to an actual string
@@ -90,7 +90,7 @@ $authToken = $token->token(); // Returns a \ParagonIE\HiddenString\HiddenString
 // Indicate when the token must expire. Note that you need to clear the token from storage yourself.
 // Pass null (or leave this method call absent) to never expire the token (not recommended).
 //
-$authToken->expiresAt(new \DateTimeImmutable('+1 hour'));
+$authToken->expireAt(new \DateTimeImmutable('+1 hour'));
 
 // Now to store the token cast the SplitToken to a SplitTokenValueHolder object.
 //

src/SplitToken.php

@@ -50,7 +50,7 @@
  * // Create
  * $splitTokenFactory = ...;
  *
- * $token = $splitTokenFactory->create();
+ * $token = $splitTokenFactory->generate();
  *
  * // The $authToken is to be shared with the receiver (eg. the user) only.
  * // And is URI safe.