bump up BuildKit to v0.3.2 (support CoreOS)

[AkihiroSuda]

Fix #45

Signed-off-by: Akihiro Suda suda.akihiro@lab.ntt.co.jp

[codecov[bot]]

Codecov Report

Merging #186 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #186   +/-   ##
=====================================
  Coverage       0%     0%           
=====================================
  Files          13     13           
  Lines         740    740           
=====================================
  Misses        740    740

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[jessfraz]

thanks!