Fix after_success causing deploy step disappear

[webknjaz]

Ref aio-libs/multidict#135
Ref travis-ci/travis-ci#8337

[webknjaz]

/cc: @asvetlov

[codecov-io]

Codecov Report

Merging #2271 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2271   +/-   ##
=======================================
  Coverage   97.29%   97.29%           
=======================================
  Files          39       39           
  Lines        8010     8010           
  Branches     1387     1387           
=======================================
  Hits         7793     7793           
  Misses         94       94           
  Partials      123      123

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