Drop old versions

[mattn]

No description provided.

[codecov-commenter]

Codecov Report

Merging #979 (502e965) into master (9537be5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #979   +/-   ##
=======================================
  Coverage   45.94%   45.94%           
=======================================
  Files          11       11           
  Lines        1480     1480           
=======================================
  Hits          680      680           
  Misses        665      665           
  Partials      135      135           

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