Change NormalizePath to append trailing slash

[stevemk14ebr]

For paths like /blah/ requests like /////blah now work. Previously this would 404 as the trailing slash was missing and NormalizePath only replaces multiples and doesn't add the trailing slash when missing.

[robjtede]

Can you add tests so we never see regressions.

[codecov-io]

Codecov Report

Merging #1433 into master will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1433      +/-   ##
==========================================
+ Coverage   47.91%   48.03%   +0.12%     
==========================================
  Files         137      137              
  Lines       12805    12826      +21     
==========================================
+ Hits         6135     6161      +26     
+ Misses       6670     6665       -5     

Impacted Files	Coverage Δ
src/middleware/normalize.rs	95.65% <100.00%> (+1.90%)	⬆️
actix-http/src/header/map.rs	54.31% <0.00%> (-0.87%)	⬇️
actix-http/src/h1/dispatcher.rs	55.88% <0.00%> (+0.25%)	⬆️
actix-http/src/h1/codec.rs	70.83% <0.00%> (+1.38%)	⬆️
actix-http/src/h1/payload.rs	73.52% <0.00%> (+5.88%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fcb1dec...e9e0746. Read the comment docs.

[robjtede]

LGTM, thanks for the contribution

[robjtede]

Can you update changelog also?

[stevemk14ebr]

done, merge it?

[JohnTitor]

Looks good, thanks!