By Matt Hladik MLB commissioner Rob Manfred is not particularly well-liked by the league’s players, and he knows it. After the lockout ended, Manfred conceded he needs to take some steps to fix his relationship with MLB players. One of those steps was to send each player on an Opening Day roster a pair of Bose headphones. In addition to the Bose headphones, each player received a “note of appreciation” from the commissioner, who has been in charge of the league since 2015. Stephen Nesbitt of The Athletic has shared a photo of the letter. “Being a Major Leaguer is an extraordinary accomplishmen…