Update CHANGELOG.md

Author: FeiChen-okta

CHANGELOG.md

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 # 2.18.0
 - Update JS libraries in SDK and E2E app
+- [#475](https://github.com/okta/okta-react-native/pull/475) Update AGP and gradle
 
 # 2.17.0
 - Don't follow redirects for OkHttp. This fixes MFA issues when using classic Okta and session token login.