use regexp for multiple keys

[cbbfcd]

🚀🚀 usage like this:

const base = penv({
  [/qatest|production/]: 'https://example.com'
})

using regularization can provide a flexible and simple combination scheme to solve the problem of multiple keys or fuzzy matching.

if u accept this pr.

[codecov[bot]]

Codecov Report

Merging #15 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #15   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          18     20    +2     
  Branches        3      4    +1     
=====================================
+ Hits           18     20    +2

Impacted Files	Coverage Δ
src/macro.js	100% <100%> (ø)	:arrow_up:

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