Update success, info, and warning colors.

[codergeek42]

Updates the success, info, and warning colors to be WCAG AA-compliant (contrast ratio of at least 4.5:1 from background color to white body text).

[codecov]

Codecov Report

Merging #943 (4aeeef4) into master (8a0a9bf) will increase coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #943      +/-   ##
==========================================
+ Coverage   55.57%   55.77%   +0.19%     
==========================================
  Files          19       19              
  Lines         511      511              
  Branches       88       88              
==========================================
+ Hits          284      285       +1     
  Misses        216      216              
+ Partials       11       10       -1     

Impacted Files	Coverage Δ
src/app/home/home.component.ts	58.57% <0.00%> (-1.43%)	⬇️
src/lib/toastr/toastr.service.ts	50.52% <0.00%> (+2.10%)	⬆️

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[deltaGPhys]

The contrast issue is preventing me from using the library - is there any chance that this will be merged?

[mymo689]

LGTM 👍