Drop Julia 0.6

[bicycle1885]

No description provided.

[codecov-io]

Codecov Report

Merging #3 into master will decrease coverage by 9.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
- Coverage    95.9%   86.75%   -9.15%     
==========================================
  Files          14       13       -1     
  Lines         513      287     -226     
==========================================
- Hits          492      249     -243     
- Misses         21       38      +17

Impacted Files	Coverage Δ
src/base16/codetable.jl	35.71% <0%> (-64.29%)	⬇️
src/base32/codetable.jl	31.25% <0%> (-60.75%)	⬇️
src/base64/codetable.jl	50% <0%> (-50%)	⬇️
src/base32/decoder.jl	92.18% <0%> (-2.51%)	⬇️
src/base32/encoder.jl	94.59% <0%> (-1.66%)	⬇️
src/base64/encoder.jl	93.93% <0%> (-1.15%)	⬇️
src/base16/decoder.jl	93.75% <0%> (-0.8%)	⬇️
src/base16/encoder.jl	94.44% <0%> (-0.3%)	⬇️
src/buffer.jl	100% <0%> (ø)	⬆️
src/state.jl	100% <0%> (ø)	⬆️
... and 1 more

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