One with the Pack (lesser)

you can have as many Beastmaster companions as your proficiency modifier, it takes 8 hours to make an animal your companion 

Additonally you can now tame beasts of CR equal to your ranger level quartered rounding down (so at level 4 you can tame CR 1 creatures and at level 20 you can tame CR 5)

at lvl 8 your Beastmaster companions no longer have a size restriction