Problem: gosh has no support for floats

[linkleonard]

Solution: Add float64 support to gosh

Fixes #31

Pull Request Notice

Before sending a pull request make sure each commit solves one clear, minimal, plausible problem. Further each commit should have the following format:

Problem: X is broken

Solution: do Y and Z to fix X

[codecov[bot]]

Codecov Report

Merging #34 into master will increase coverage by 0.57%. The diff coverage is 87.93%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   77.44%   78.01%   +0.57%     
==========================================
  Files           4        4              
  Lines        1002     1060      +58     
==========================================
+ Hits          776      827      +51     
- Misses        194      200       +6     
- Partials       32       33       +1

Impacted Files	Coverage Δ
scanner/scanner.go	96.57% <100%> (+0.15%)	:arrow_up:
parser/parser.go	67.16% <63.63%> (-0.09%)	:arrow_down:
interpreter/interpreter.go	75.47% <90.9%> (+2.19%)	:arrow_up:

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