Cambio de logo en el header: añadido logo2.png y actualizado import#17

aznarez138165 wants to merge 17 commits intosimpletut:mastersimpletut/Testing-React-Redux-with-Jest-and-Enzyme:masterfrom

aznarez138165:feature/change-header-logoaznarez138165/Testing-React-Redux-with-Jest-and-Enzyme:feature/change-header-logoCopy head branch name to clipboard