add http\Env::reset(); re: #90

[m6w6]

re: #90

[codecov]

Codecov Report

Merging #117 (5a3dce1) into master (114dee0) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
- Coverage   85.41%   85.39%   -0.03%     
==========================================
  Files          42       42              
  Lines        9245     9250       +5     
==========================================
+ Hits         7897     7899       +2     
- Misses       1348     1351       +3     

Impacted Files	Coverage Δ
src/php_http_env.c	85.13% <50.00%> (-0.67%)	⬇️

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