fix(scan): support index.{ext}

[pi0]

fixes #23

Edge case: Having base/Button/index.vue and base/Button/Button.vue ends with registering same name. In this case, we show a warning message and ignore 2nd+ matches:

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Related (#29) It also warns about conflicting names if not using proper pattern:

[codecov]

Codecov Report

Merging #30 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #30   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          147       153    +6     
  Branches        31        33    +2     
=========================================
+ Hits           147       153    +6     

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

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