The ornamental design for the divider assembly, as shown and described.
FIG. 1 is a front elevational view of the divider assembly;
FIG. 2 is a side elevation view of FIG. 1;
FIG. 3 is a rear elevation view of FIG. 1;
FIG. 4 is a top plan view of FIG. 1;
FIG. 5 is a bottom plan view of FIG. 1;
FIG. 6 is a cross sectional view of one of the joints of FIG. 1;
FIG. 7 is a front perspective view of the divider assembly; and,
FIG. 8 is a rear perspective view of the divider assembly.
The broken lines showing two other sections are included for the purpose of illustrating portions of the divider assembly that form no part of the claimed design.