fixes for julia 0.7

[fredrikekre]

No description provided.

[fredrikekre]

requires JuliaMath/FixedPointNumbers.jl#110 to pass tests

[fredrikekre]

Ok, FixedPointNumbers is merged and tagged, should pass CI now.

[ararslan]

The changes here suggest that dropping 0.6 support isn't strictly necessary, but might as well I guess.

[codecov-io]

Codecov Report

Merging #105 into master will increase coverage by 0.43%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   99.28%   99.71%   +0.43%     
==========================================
  Files           5        5              
  Lines         417      348      -69     
==========================================
- Hits          414      347      -67     
+ Misses          3        1       -2

Impacted Files	Coverage Δ
src/operations.jl	100% <ø> (ø)	⬆️
src/traits.jl	100% <100%> (+2.09%)	⬆️
src/types.jl	99.16% <100%> (-0.84%)	⬇️
src/show.jl	100% <100%> (ø)	⬆️

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