Fixed parsing lone numbers

[cjermain]

This PR follows #13, which addressed issues with numbers on their own failing to deserialized. That solution was only a partial fix, because the tests were not rigorous enough to assert that the values were correct. 😞 I've updated the tests to explicitly assert the values are correct, and realized I had been missing the number_end increment, which was causing the numbers to be truncated. I reordered the operations in parse_number to fix that.

[codecov]

Codecov Report

Base: 99.63% // Head: 99.63% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (5a954fa) compared to base (b3d44a3).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   99.63%   99.63%           
=======================================
  Files           9        9           
  Lines         272      273    +1     
=======================================
+ Hits          271      272    +1     
  Misses          1        1           

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

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