Update chromium_downloader.py

[kamira]

update chromium download api url

[codecov-io]

Codecov Report

Merging #305 into dev will decrease coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #305      +/-   ##
==========================================
- Coverage   92.38%   92.35%   -0.03%     
==========================================
  Files          48       48              
  Lines        7105     7105              
==========================================
- Hits         6564     6562       -2     
- Misses        541      543       +2     

Impacted Files	Coverage Δ
pyppeteer/chromium_downloader.py	39.28% <100.00%> (ø)
tests/test_frame.py	96.53% <0.00%> (-0.65%)	:arrow_down:
pyppeteer/execution_context.py	93.33% <0.00%> (+0.74%)	:arrow_up:

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[kamira]

Update chrome version