Update CHANGELOG.md for v2.5.3 [ci skip]
Update CHANGELOG.md for v2.5.3 [ci skip]

beatfactor/mocha,JohnnyEstilles/mocha,sul4bh/mocha,santiagoaguiar/mocha,sul4bh/mocha,Khan/mocha,adamgruber/mocha,hoverduck/mocha,rlugojr/mocha,Khan/mocha,menelaos/mocha-solarized,mochajs/mocha,adamgruber/mocha,JohnnyEstilles/mocha,beatfactor/mocha,boneskull/mocha,villesau/mocha,mochajs/mocha,Hacker0x01/mocha,mochajs/mocha,hoverduck/mocha,hoverduck/mocha,villesau/mocha,adamgruber/mocha,nightwatchjs/mocha-nightwatch,boneskull/mocha,menelaos/mocha-solarized,santiagoaguiar/mocha,igwejk/mocha,boneskull/mocha,apkiernan/mocha,santiagoaguiar/mocha,rlugojr/mocha,Hacker0x01/mocha,beatfactor/mocha,outsideris/mocha,nightwatchjs/mocha-nightwatch,Hacker0x01/mocha,Khan/mocha,hoverduck/mocha,rlugojr/mocha,igwejk/mocha,apkiernan/mocha,nightwatchjs/mocha-nightwatch,menelaos/mocha-solarized,sul4bh/mocha,JohnnyEstilles/mocha,villesau/mocha,apkiernan/mocha,outsideris/mocha