Rename import path to github.com/360EntSecGroup-Skylar/excelize

[jinzhu]

Seems like we need to change import path to github.com/360EntSecGroup-Skylar/excelize?

[codecov-io]

Codecov Report

Merging #153 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #153   +/-   ##
=======================================
  Coverage   98.45%   98.45%           
=======================================
  Files          14       14           
  Lines        3171     3171           
=======================================
  Hits         3122     3122           
  Misses         30       30           
  Partials       19       19

Impacted Files	Coverage Δ
cell.go	99.26% <ø> (ø)	⬆️
picture.go	99.23% <ø> (ø)	⬆️
chart.go	99.14% <ø> (ø)	⬆️

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[javasgl]

import path "github.com/360EntSecGroup-Skylar/excelize/v2" was a little bit ugly.

SHOULD BE lowercase-without-dash witch is recommend by golang