docs: fix env config path

[0xtoorich]

Checklist

• [x] documentation is changed or added
• [x] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

README 说明文档中，修正 config.{env}.js 的路径错误。

[codecov[bot]]

Codecov Report

Merging #90 (31a4dfc) into master (f585da5) will increase coverage by 1.60%. The diff coverage is n/a.

:exclamation: Current head 31a4dfc differs from pull request most recent head 9b665d7. Consider uploading reports for the commit 9b665d7 to get more accurate results

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
+ Coverage   85.71%   87.32%   +1.60%     
==========================================
  Files           4        4              
  Lines          63       71       +8     
  Branches        0       16      +16     
==========================================
+ Hits           54       62       +8     
  Misses          9        9              

Impacted Files	Coverage Δ
lib/loader.js	86.36% <0.00%> (+1.88%)	:arrow_up:

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