Update CHANGELOG.md

Author: pose

CHANGELOG.md

@@ -3,6 +3,41 @@
 All notable changes to this project will be documented in this file starting from version **v4.0.0**.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [5.0.0] - 2015-04-11
+
+### Changed
+
+ - [sign] Only set defautl `iat` if the user does not specify that argument.
+
+Documenting verify `algorithms` parameter. (`pose - dschenkelman`)
+  https://github.com/auth0/node-jsonwebtoken/commit/e900282a8d2dff1d4dec815f7e6aa7782e867d91
+  https://github.com/auth0/node-jsonwebtoken/commit/35036b188b4ee6b42df553bbb93bc8a6b19eae9d
+  https://github.com/auth0/node-jsonwebtoken/commit/954bd7a312934f03036b6bb6f00edd41f29e54d9
+  https://github.com/auth0/node-jsonwebtoken/commit/24a370080e0b75f11d4717cd2b11b2949d95fc2e
+  https://github.com/auth0/node-jsonwebtoken/commit/a77df6d49d4ec688dfd0a1cc723586bffe753516
+
+### Security
+
+ - [verify] Update to jws@^3.0.0 and renaming `header.alg` mismatch exception to `invalid algorithm` and adding more mismatch tests. 
+ 
+  As `[email protected]` changed the verify method signature to be `jws.verify(signature, algorithm, secretOrKey)`, the token header must be decoded first in order to make sure that the `alg` field matches one of the allowed `options.algorithms`. After that, the now validated `header.alg` is passed to `jws.verify`
+ 
+ As the order of steps has changed, the error that was thrown when the JWT was invalid is no longer the `jws` one:
+ ```
+ { [Error: Invalid token: no header in signature 'a.b.c'] code: 'MISSING_HEADER', signature: 'a.b.c' }
+ ```
+
+ That old error (removed from jws) has been replaced by a `JsonWebTokenError` with message `invalid token`.
+ 
+ > Important: the 4.x branch of the library is secure to use but we decided to deprecate everything `< 5.0.0` to prevent security warnings from library `node-jws` when doing `npm install`.
+  https://github.com/auth0/node-jsonwebtoken/commit/634b8ed0ff5267dc25da5c808634208af109824e
+  https://github.com/auth0/node-jsonwebtoken/commit/9f24ffd5791febb449d4d03ff58d7807da9b9b7e
+  https://github.com/auth0/node-jsonwebtoken/commit/19e6cc6a1f2fd90356f89b074223b9665f2aa8a2
+  https://github.com/auth0/node-jsonwebtoken/commit/1e4623420159c6410616f02a44ed240f176287a9
+  https://github.com/auth0/node-jsonwebtoken/commit/954bd7a312934f03036b6bb6f00edd41f29e54d9
+  https://github.com/auth0/node-jsonwebtoken/commit/24a370080e0b75f11d4717cd2b11b2949d95fc2e
+  https://github.com/auth0/node-jsonwebtoken/commit/a77df6d49d4ec688dfd0a1cc723586bffe753516
+
 ## [4.2.2] - 2015-03-26
 ### Fixed