Update 'README.md'

Fixed code blocks

README.md

@@ -30,66 +30,71 @@ Install using composer:
 You need a key for both generating and parsing tokens. Create a `JwtDerivedKey`
 or a `JwtPlaintextKey` and pass it to the `JwtToken` constructor:
 
-    use NoccyLabs\SimpleJwt\Key\{JwtDerivedKey,JwtPlaintextKey}
+```php
+use NoccyLabs\SimpleJwt\Key\{JwtDerivedKey,JwtPlaintextKey}
 
-    // Derive a key using secret and salt...
-    $key = new JwtDerivedKey("secret", "salt");
-    // ...or use a prepared plaintext key
-    $key = new JwtPlaintextKey("This Should Be Binary Data..");
+// Derive a key using secret and salt...
+$key = new JwtDerivedKey("secret", "salt");
+// ...or use a prepared plaintext key
+$key = new JwtPlaintextKey("This Should Be Binary Data..");
+```
 
 ### Generating tokens
 
+```php
+use NoccyLabs\SimpleJwt\JwtToken;
 
+$tok = new JwtToken($key);
+$tok->setExpiry("1h");
+$tok->claims->add("some/claim/MaxItems", 8);
 
-    use NoccyLabs\SimpleJwt\JwtToken;
-
-    $tok = new JwtToken($key);
-    $tok->setExpiry("1h");
-    $tok->claims->add("some/claim/MaxItems", 8);
-
-    $str = $tok->getSignedToken();
-
+$str = $tok->getSignedToken();
+```
 
 ### Parsing tokens
 
 Parsing is done by passing the raw token as the 2nd parameter
 
-    use NoccyLabs\SimpleJwt\JwtToken;
+```php
+use NoccyLabs\SimpleJwt\JwtToken;
 
-    $str = "...received token...";
+$str = "...received token...";
 
-    $tok = new JwtToken($key, $str);
+$tok = new JwtToken($key, $str);
 
-    if (!$tok->isValid()) {
+if (!$tok->isValid()) {
     // This check works, but using the validator might be better
-    }
+}
 
-    // Using ->has() follwed by ->get() is one way
-    if ($tok->claims->has("some/claim/MaxItems")) {
+// Using ->has() follwed by ->get() is one way
+if ($tok->claims->has("some/claim/MaxItems")) {
     // The claim exists, we can get the value (if any)
     $val = $tok->claims->get("some/claim/MaxItems");
-    }
+}
 
-    // You can also use valueOf() to return a default value if needed
-    $val = $tok->claims->valueOf("some/claim/MaxItems", 64);
+// You can also use valueOf() to return a default value if needed
+$val = $tok->claims->valueOf("some/claim/MaxItems", 64);
+```
 
 ### Validating tokens
 
-    use NoccyLabs\SimpleJwt\Validator\JwtValidator;
+```php
+use NoccyLabs\SimpleJwt\Validator\JwtValidator;
 
-    $validator = new JwtValidator();
-    // Require that some claim exists
-    $validator
+$validator = new JwtValidator();
+// Require that some claim exists
+$validator
     ->requireIssuer("api.issuer.tld")
     ->requireAudience(["api.issuer.tld", "foo.issuer.tld"])
     ->addRequiredClaim("some/required/Claim");
 
-    try {
+try {
     // Pass a JwtToken to validateToken()...
     $valid = $validator->validateToken($tok);
     // ...or pass a JwtKeyInterface and the raw string to validate()
     $valid = $validator->validate($key, $tokenstr);
-    }
-    catch (JwtValidatorException $e) {
+}
+catch (JwtValidatorException $e) {
     // validation failed
-    }
+}
+```