fix typo

Author: xabbuh

CHANGELOG.md

@@ -7,7 +7,7 @@ CHANGELOG
  * Add `HttpOptions::setHeader()` to add or replace a single header
  * Allow mocking `start_time` info in `MockResponse`
  * Add `MockResponse::fromFile()` and `JsonMockResponse::fromFile()` methods to help using fixtures files
- * Add `ThrottlingHttpClient` to enable limiting the number request within a certain period
+ * Add `ThrottlingHttpClient` to enable limiting the number of requests within a certain period
 
 7.0
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