fix: ignore template sources

[alexander-akait]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

ignore template like src/srcset

Breaking Changes

No

Additional Info

fixes #313

[codecov]

Codecov Report

Merging #314 into master will decrease coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
- Coverage   98.70%   98.46%   -0.24%     
==========================================
  Files           7        7              
  Lines         385      391       +6     
  Branches      101      103       +2     
==========================================
+ Hits          380      385       +5     
- Misses          5        6       +1     

Impacted Files	Coverage Δ
src/plugins/source-plugin.js	97.89% <100.00%> (+0.09%)	⬆️
src/utils.js	99.11% <100.00%> (-0.45%)	⬇️

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