Remove methods such as sinτ

[hyrodium]

This PR fixes #49.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (d00aa03) 95.23% compared to head (bf826d4) 95.23%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   95.23%   95.23%           
=======================================
  Files           1        1           
  Lines          21       21           
=======================================
  Hits           20       20           
  Misses          1        1           

Impacted Files	Coverage Δ
src/Tau.jl	95.23% <100.00%> (ø)

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[devmotion]

See #49 (comment), I think there's no need to remove the Unicode aliases.