By Matt Audilet On Wednesday, Colorado Rockies outfielder Charlie Blackmon became the first active player in MLB history to endorse a gambling sportsbook — agreeing to a partnership with Colorado-based bookmaker MaximBet. Before the league’s new collective bargaining agreement was put into place this offseason, sponsorship deals with sportsbooks were prohibited for players and coaches. But according to the MLB’s new policy, Blackmon and other players are now allowed to promote general sports betting (not baseball specifically). Pete Rose weighed in on the league’s new policy on Thursday. “I ju…