Add support for Sawtooth and Triangle waves

[amrali]

No description provided.

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (f6513a3) compared to base (3fa89c6).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #13   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           53        57    +4     
=========================================
+ Hits            53        57    +4     

Impacted Files	Coverage Δ
src/wave.rs	100.00% <100.00%> (ø)

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