Add test to assert CHANGELOG format (#1582)

CHANGELOG.md

@@ -165,6 +165,8 @@
 
 ## 1.7.2
 
+### Changed
+
 - Make sure we can get credentials even if the cache storage fails
 - Clear `realpath` cache to make sure we get the latest credentials token
 
@@ -236,15 +238,15 @@
 - Support for CloudFront in `AwsClientFactory`
 - Support for RdsDataService in `AwsClientFactory`
 
-### Fixed
-
-- Allows non-AWS regions when using custom endpoints
-
 ### Changed
 
 - Add more context to error logs
 - Log level for 404 responses changed to "info".
 
+### Fixed
+
+- Allows non-AWS regions when using custom endpoints
+
 ## 1.2.0
 
 ### Added
@@ -256,7 +258,7 @@
 - Support for global and regional endpoints
 - Add a `Configuration::optionExists` to allow third parties to check if an option is available (needed by libraries supporting several versions of core)
 
-### Deprecation
+### Deprecated
 
 - Clients extending `AbstractApi` should override `getEndpointMetata`. The method will be abstract in 2.0
 - Custom endpoints should not contain `%region%` and `%service` placeholder. They won't be replaced anymore in 2.0
@@ -321,6 +323,13 @@
 
 ## 0.5.0
 
+### Removed
+
+- The input's `validate()` function was merged with the `request()` function.
+- `Configuration::isDefault()`.
+- Protected property `AbstractApi::$logger`.
+- `AsyncAws\Core\StreamableBody` in favor of `AsyncAws\Core\Stream\ResponseBodyStream`.
+
 ### Added
 
 - Add support for multiregion via `@region` input parameter.
@@ -334,13 +343,6 @@
 - Internal `AsyncAws\Core\RequestContext`.
 - Internal `AsyncAws\Core\Stream\RewindableStream`.
 
-### Removed
-
-- The input's `validate()` function was merged with the `request()` function.
-- `Configuration::isDefault()`.
-- Protected property `AbstractApi::$logger`.
-- `AsyncAws\Core\StreamableBody` in favor of `AsyncAws\Core\Stream\ResponseBodyStream`.
-
 ### Changed
 
 - Exceptions will contain more information from the HTTP response.
@@ -360,6 +362,11 @@
 
 ## 0.4.0
 
+### Removed
+
+- Public `AbstractApi::request()` was removed.
+- Protected function `AbstractApi::getEndpoint()` was made private.
+
 ### Added
 
 - Test class `AsyncAws\Core\Test\SimpleStreamableBody`
@@ -372,11 +379,6 @@
 - Class `AsyncAws\Core\Stream\StreamFactory` is not internal anymore.
 - Removed `requestBody()`, `requestHeaders()`, `requestQuery()` and `requestUri()` input classes. They are replaced with `request()`.
 
-### Removed
-
-- Public `AbstractApi::request()` was removed.
-- Protected function `AbstractApi::getEndpoint()` was made private.
-
 ### Fixed
 
 - Fix Instance Provider Role fetching