httpauth: Bump up to 0.4.2

[JohnTitor]

I think it's worth to go with 0.4.2 before making alpha release.

[codecov]

Codecov Report

Merging #77 into master will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
+ Coverage   78.97%   79.09%   +0.12%     
==========================================
  Files          24       24              
  Lines        2026     2019       -7     
==========================================
- Hits         1600     1597       -3     
+ Misses        426      422       -4     

Impacted Files	Coverage Δ
actix-cors/src/lib.rs	83.83% <ø> (ø)
actix-identity/src/lib.rs	95.58% <100.00%> (+0.88%)	⬆️
actix-protobuf/src/lib.rs	46.78% <100.00%> (ø)
actix-session/src/cookie.rs	89.16% <100.00%> (ø)
actix-session/src/lib.rs	86.95% <100.00%> (ø)

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