add changelog

Author: sephiroth-j

CHANGELOG.md

@@ -0,0 +1,56 @@
+# Spring Security LTPA2 - Changelog
+
+## Unreleased
+### ⚠ Breaking
+### ⭐ New Features
+### 🐞 Bugs Fixed
+
+##  v1.0.0 - 2020-01-05
+### ⚠ Breaking
+- Spring Security 5.1 is at least required
+- `Ltpa2Filter` will now return `FORBIDDEN` instead of `UNAUTHORIZED` when there was a problem with the token or the user was not found.
+This corresponds more to the HTTP specification and matches the default behavior when no token was given at all.
+- The dependencies on Spring Security and `slf4j-api` are no longer optional - only `reactor-core` is optional as it is only required for the reactive stack.
+
+### ⭐ New Features
+- Support the Reactive Stack with `Ltpa2AuthConverter` and `Ltpa2AuthManager`
+check the [README](README.md) for the details
+- Emit a warning when `allowExpiredToken` is enabled.
+
+### 🐞 Bugs Fixed
+
+##  v0.2.3 - 2019-05-05
+### ⚠ Breaking
+### ⭐ New Features
+- **made most of the methods in `Ltpa2Utils` public**
+
+### 🐞 Bugs Fixed
+- fix: `Ltpa2Configurer` did not call `afterPropertiesSet` on the `Ltpa2Filter` instance after all properties where set which could lead to runtime errors
+- other smaller fixes and increased test coverage
+
+##  v0.2.2 - 2018-08-09
+### ⚠ Breaking
+### ⭐ New Features
+- replaced `lombok.NonNull` with `org.springframework.lang.NonNull`
+
+### 🐞 Bugs Fixed
+- ensure "expire" and "user" attributes are not empty when set
+
+##  v0.2.1 - 2018-08-09
+### ⚠ Breaking
+### ⭐ New Features
+### 🐞 Bugs Fixed
+- This release fixes an issue with different timezones when converting the expire attribute from unix timestamp to `LocalDateTime` and back.
+
+##  v0.2.0 - 2018-03-11
+### ⚠ Breaking
+### ⭐ New Features
+- allow custom header name
+- update examples / usage page
+
+### 🐞 Bugs Fixed
+-  do not assume a fixed length for the private exponent and read its length from the private-exponent-length-field
+- `afterPropertiesSet()` did not allow an empty value for `headerValueIdentifier` although it is allowed
+
+##  v0.1.0 - 2018-03-07
+initial release