[DOCS] Update last commit tag in v0.2.4 release notes

Post taggig v0.2.4 we update release notes about last commit tag
of v0.2.4 release.

Signed-off-by: Anup Patel <anup@brainfault.org>
Merge pull request #92 from avpatel/master

[DOCS] Update last commit tag in v0.2.4 release notes