feat: Add SetText method to change the initial text

[codekidX]

Hello,

I added a method called SetText to change the text in between frame loop. This can be used to change the initial text that we pass in New method.

Thought it might be useful to others too.

[codecov[bot]]

Codecov Report

Merging #7 into master will decrease coverage by 3.81%. The diff coverage is 0%.

@@            Coverage Diff            @@
##           master      #7      +/-   ##
=========================================
- Coverage   76.31%   72.5%   -3.82%     
=========================================
  Files           1       1              
  Lines          38      40       +2     
=========================================
  Hits           29      29              
- Misses          8      10       +2     
  Partials        1       1

Impacted Files	Coverage Δ
spin.go	72.5% <0%> (-3.82%)	:arrow_down:

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