version bump; req. 1.6

[jverzani]

• bump version
• drop CI for 1.5; req 1.5 in compat
• add test for zero polynomial (return empty collection)

[codecov[bot]]

Codecov Report

Merging #14 (8b88c28) into master (5b12cd4) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   86.70%   86.70%   -0.01%     
==========================================
  Files          19       18       -1     
  Lines        1896     1895       -1     
==========================================
- Hits         1644     1643       -1     
  Misses        252      252              

Impacted Files	Coverage Δ
src/twisted.jl	86.89% <0.00%> (-0.44%)	:arrow_down:
src/AMRVW.jl
src/diagonal.jl	85.89% <0.00%> (+0.31%)	:arrow_up:

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