Retrieving the serialized bytes from a Julia FlatBuffer

[samtkaplan]

This is to try and address the confusion that I had in #20. Now one can do:

...
x = Foo.Bar(1)
xbuilder = FlatBuffers.build!(x)

y = FlatBuffers.read(Foo.Bar, FlatBuffers.bytes(xbuilder))
...

I tried to run docs/make.jl, but it gave an error on my system.

[codecov-io]

Codecov Report

Merging #21 into master will increase coverage by 0.51%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
+ Coverage   84.61%   85.13%   +0.51%     
==========================================
  Files           3        3              
  Lines         416      417       +1     
==========================================
+ Hits          352      355       +3     
+ Misses         64       62       -2

Impacted Files	Coverage Δ
src/FlatBuffers.jl	72.57% <100%> (+1.3%)	:arrow_up:

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[quinnj]

Thanks!