handle default statements with fallthrough properly [fix #423]

[vigneshshanmugam]

• fixes Default case in the middle of a switch doesn't fallthrough correctly #423

[codecov]

Codecov Report

Merging #482 into master will increase coverage by 0.22%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #482      +/-   ##
=========================================
+ Coverage   82.38%   82.6%   +0.22%     
=========================================
  Files          35      35              
  Lines        2611    2685      +74     
  Branches      923     950      +27     
=========================================
+ Hits         2151    2218      +67     
- Misses        280     285       +5     
- Partials      180     182       +2

Impacted Files	Coverage Δ
packages/babel-plugin-minify-simplify/src/index.js	80.72% <100%> (+0.4%)	⬆️
...ages/babel-plugin-minify-mangle-names/src/index.js	75.4% <0%> (-1%)	⬇️
packages/babel-plugin-minify-builtins/src/index.js	92.3% <0%> (+1.53%)	⬆️

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