add sponsor badge #61

Job	Run time
Tests with Mosek (branch-and-bound/test_bab_knapsack_Mosek)	8m 22s
Tests with GLPK (branch-and-bound/test_bab_knapsack_GLPK)	4m 59s
Tests with HiGHS (branch-and-bound/test_bab_knapsack_HiGHS)	9m 8s
Tests with Mosek (branch-and-bound/test_bab_location_Mosek)	7m 53s
Tests with modeling interface	3m 34s
Tests with GLPK (branch-and-bound/test_bab_location_GLPK)	4m 22s
Tests with Mosek (branch-and-price/test_bap_assignment_Mosek)	7m 52s
Tests with HiGHS (branch-and-bound/test_bab_location_HiGHS)	9m 52s
Tests with GLPK (branch-and-price/test_bap_assignment_GLPK)	6m 33s
Tests with HiGHS (branch-and-price/test_bap_assignment_HiGHS)	11m 6s
Upload coverage report	23s
	1h 14m 4s

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