Civil rights — Employment discrimination — Black female employee sued employer under Title VII and 42 U.S.C. §1981 asserting claims for discriminatory termination, hostile work environment, and retaliation — District court erred in concluding that plaintiff waived her discriminatory termination claim through her deposition testimony –Plaintiff offered sufficient evidence to create a genuine issue of material fact that employer had actual notice of the hostile work environment where record contains evidence that plaintiff’s supervisor had actual notice of hostile work environment despite plaintiff’s failure to report the harassment until final day of her employment, and supervisor’s notice can be imputed to employer