WIP: ensure helpers are loaded

[blueyed]

TODO:

• test with newer Vim - the error was visible when adding some sleep before/during the test run

[codecov-io]

Codecov Report

Merging #190 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage    86.8%   86.81%   +0.01%     
==========================================
  Files          12       12              
  Lines         826      827       +1     
==========================================
+ Hits          717      718       +1     
  Misses        109      109

Flag	Coverage Δ
#nvim	83.19% <100%> (+0.02%)	⬆️
#vim	85.97% <100%> (+0.01%)	⬆️

Impacted Files	Coverage Δ
autoload/vader.vim	90% <100%> (+0.03%)	⬆️

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