Updated changelog for 2.0.1.
Updated changelog for 2.0.1.

ywjrg/pannellum,quentinyang/pannellum,Benvii/pannellum,psteph801/psteph801.github.io,Benvii/pannellum,ywjrg/pannellum,riuson/pannellum,eric-seekas/pannellum,eric-seekas/pannellum,riuson/pannellum,Benvii/pannellum,eric-seekas/pannellum,riuson/pannellum,mpetroff/pannellum,mpetroff/pannellum,psteph801/psteph801.github.io,riuson/pannellum,Benvii/pannellum,ywjrg/pannellum,mpetroff/pannellum,psteph801/psteph801.github.io,psteph801/psteph801.github.io,quentinyang/pannellum,mpetroff/pannellum,ywjrg/pannellum,eric-seekas/pannellum,quentinyang/pannellum,quentinyang/pannellum