ReleaseNotes: mention upgrade to cURL v7.62.0

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

ReleaseNotes.md

@@ -40,6 +40,7 @@ This package contains software from a number of other projects including Bash, z
 * Comes with [Git Credential Manager v1.18.2](https://github.com/Microsoft/Git-Credential-Manager-for-Windows/releases/tag/v1.18.2).
 * Comes with [OpenSSH v7.9p1](https://www.openssh.com/txt/release-7.9).
 * The description of the editor option to choose Vim [has been clarified](https://github.com/git-for-windows/build-extra/pull/207) to state that this *unsets* `core.editor`.
+* Comes with [cURL v7.62.0](https://curl.haxx.se/changes.html#7_62_0).
 
 ## Changes since Git for Windows v2.19.0 (September 11th 2018)