adjust compat; check typos; readme

[jverzani]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c0160d4) 75.64% compared to head (230eee5) 75.64%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #540   +/-   ##
=======================================
  Coverage   75.64%   75.64%           
=======================================
  Files          38       38           
  Lines        3999     3999           
=======================================
  Hits         3025     3025           
  Misses        974      974           

Files	Coverage Δ
src/Polynomials.jl	100.00% <ø> (ø)
src/abstract-polynomial.jl	80.88% <ø> (ø)
src/common.jl	80.15% <ø> (ø)
...mial-container-types/immutable-dense-polynomial.jl	84.47% <ø> (ø)
...ontainer-types/mutable-dense-laurent-polynomial.jl	84.39% <ø> (ø)
...polynomials/standard-basis/immutable-polynomial.jl	96.15% <ø> (ø)
src/polynomials/standard-basis/standard-basis.jl	70.84% <100.00%> (ø)

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