Add autoplot and fortify methods for renyi and renyiaccum

[codecov-io]

Codecov Report

Merging #14 into master will not change coverage. The diff coverage is 0%.

@@         Coverage Diff          @@
##           master   #14   +/-   ##
====================================
  Coverage       0%    0%           
====================================
  Files          20    26    +6     
  Lines         534   630   +96     
====================================
- Misses        534   630   +96

Impacted Files	Coverage Δ
R/autoplot.anosim.R	0% <ø> (ø)	:arrow_up:
R/autoplot.cca.R	0% <0%> (ø)	:arrow_up:
R/autoplot.poolaccum.R	0% <0%> (ø)
R/autoplot.fisherfit.R	0% <0%> (ø)	:arrow_up:
R/autoplot.rda.R	0% <0%> (ø)	:arrow_up:
R/fortify.renyi.R	0% <0%> (ø)
R/autoplot.renyi.R	0% <0%> (ø)
R/autoplot.isomap.R	0% <0%> (ø)	:arrow_up:
R/fortify.renyiaccum.R	0% <0%> (ø)
R/autoplot.prestonfit.R	0% <0%> (ø)	:arrow_up:
... and 12 more

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[delferts]

Closing pull request to make clean one without already merged staff.