refactor: rename makeSmartContractDeploy for makeContractDeploy

[yknl]

This PR renames the makeSmartContractDeploy() function to makeContractDeploy.

Resolves: https://github.com/blockstack/stacks-transactions-js/issues/76

Type of Change

• [ ] New feature
• [ ] Bug fix
• [ ] API reference/documentation update
• [x] Other

Checklist

• [x] Code is commented where needed
• [x] Unit test coverage for new or modified code paths
• [x] npm run test passes
• [x] Changelog is updated
• [x] Tag 1 of @yknl, @zone117x, @reedrosenbluth for review

[codecov[bot]]

Codecov Report

Merging #97 into master will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   84.01%   84.01%           
=======================================
  Files          28       28           
  Lines        1802     1802           
  Branches      367      367           
=======================================
  Hits         1514     1514           
  Misses        286      286           
  Partials        2        2           

Impacted Files	Coverage Δ
src/builders.ts	76.14% <100.00%> (ø)

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