Allow leaf module to have the same name as top module

[Drvi]

Fixes #16

[codecov]

Codecov Report

Merging #17 (3eeeb8a) into master (95c669d) will increase coverage by 0.09%.
The diff coverage is 90.90%.

❗ Current head 3eeeb8a differs from pull request most recent head d40129b. Consider uploading reports for the commit d40129b to get more accurate results

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   89.07%   89.16%   +0.09%     
==========================================
  Files          25       25              
  Lines        2754     2760       +6     
==========================================
+ Hits         2453     2461       +8     
+ Misses        301      299       -2     

Impacted Files	Coverage Δ
src/ProtocolBuffers.jl	75.00% <ø> (ø)
src/precompile.jl	0.00% <0.00%> (ø)
src/codegen/modules.jl	88.75% <75.00%> (+0.80%)	⬆️
src/codegen/names.jl	100.00% <100.00%> (ø)
src/codegen/types.jl	97.80% <100.00%> (ø)
src/codegen/utils.jl	75.78% <100.00%> (+0.78%)	⬆️

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