Fix docker build.

[petr-korobeinikov]

Hello 👋!

Just found a problem with Dockerfile.
It was impossible to build an image.

So, glad to propose this fix.

Now command works as expected:

docker build --build-arg KLEPTO_VERSION=0.3.1 --tag klepto .

Thank you 🤝 !

[codecov-commenter]

Codecov Report

Merging #131 (f11f023) into master (a0d9648) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #131   +/-   ##
=======================================
  Coverage   46.96%   46.96%           
=======================================
  Files           8        8           
  Lines         313      313           
=======================================
  Hits          147      147           
  Misses        159      159           
  Partials        7        7           

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[lucasmdrs]

Thank you for the contribution @pkorobeinikov ! 🎉