fix: fix partial file path

[littlecxm]

• should use same func generate partial file path
• should use filepath.Join to solve cross-platform path
  

  pget/download.go

  Line 273 in 8f357a2

  name := fmt.Sprintf("%s/%s.%d.%d", partialDir, c.Filename, c.Procs, i)

[codecov]

Codecov Report

Merging #58 (419ada5) into master (8f357a2) will decrease coverage by 1.84%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   70.27%   68.44%   -1.84%     
==========================================
  Files           7        7              
  Lines         508      507       -1     
==========================================
- Hits          357      347      -10     
- Misses        112      120       +8     
- Partials       39       40       +1     

Impacted Files	Coverage Δ
download.go	67.61% <75.00%> (-6.02%)	⬇️
util.go	91.17% <100.00%> (+1.52%)	⬆️

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