Fix typo "valud" to "value" in docs of `from_dict`

[codecov[bot]]

Codecov Report

Merging #49 (eaec7ed) into master (0251f24) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #49   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          313       324   +11     
=========================================
+ Hits           313       324   +11     

Impacted Files	Coverage Δ
src/parse.jl	100.00% <ø> (ø)
src/utils.jl	100.00% <0.00%> (ø)
src/codegen.jl	100.00% <0.00%> (ø)
src/serialize.jl	100.00% <0.00%> (ø)

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[Roger-luo]

thanks!