Updated the copyright year in the license file.
Updated the copyright year in the license file.

shinjukunian/core-plot,core-plot/core-plot,core-plot/core-plot,shinjukunian/core-plot,shinjukunian/core-plot,core-plot/core-plot,core-plot/core-plot,shinjukunian/core-plot,shinjukunian/core-plot