update changelog

Author: adrai

CHANGELOG.md

@@ -3,6 +3,12 @@
 - fix for Deno 2 and removal of unnecessary .cjs file
 - for esm build environments not supporting top-level await, you should import the `i18next-http-backend/cjs` export or stay at v2.6.2
 
+### 2.7.1
+- same as 2.6.2
+
+### 2.7.0
+- deprecated, same as v3.0.0
+
 ### 2.6.2
 
 - improve network error detection across browsers [152](https://github.com/i18next/i18next-http-backend/pull/152)