run AppVeyor on Julia 0.6

[bicycle1885]

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[codecov-io]

Codecov Report

Merging #16 into master will decrease coverage by 0.3%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   98.34%   98.04%   -0.31%     
==========================================
  Files           7        7              
  Lines         666      666              
==========================================
- Hits          655      653       -2     
- Misses         11       13       +2

Impacted Files	Coverage Δ
src/streamreader.jl	97% <0%> (-1%)	⬇️
src/node.jl	98.1% <0%> (-0.28%)	⬇️

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