eax: bump cipher to v0.4

[tarcieri]

No description provided.

[codecov-commenter]

Codecov Report

Merging #451 (629611f) into master (bea4236) will decrease coverage by 0.04%.
The diff coverage is 54.54%.

@@            Coverage Diff             @@
##           master     #451      +/-   ##
==========================================
- Coverage   87.21%   87.16%   -0.05%     
==========================================
  Files          40       40              
  Lines        1955     1956       +1     
==========================================
  Hits         1705     1705              
- Misses        250      251       +1     

Impacted Files	Coverage Δ
eax/src/online.rs	0.00% <0.00%> (ø)
eax/src/lib.rs	90.62% <100.00%> (ø)

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