Update for princurve 2.0.2

[rcannood]

• Bumped version number up to 1.0.1
• Altered code to work with princurve 2.0.2
• Removed deprecated functions
• Fixed documentation
• Added code coverage as mentioned in SCORPIUS dynverse/dynmethods#17

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@9493cff). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master       #7   +/-   ##
=========================================
  Coverage          ?   69.02%           
=========================================
  Files             ?       13           
  Lines             ?      481           
  Branches          ?        0           
=========================================
  Hits              ?      332           
  Misses            ?      149           
  Partials          ?        0

Impacted Files	Coverage Δ
R/plotting.R	0% <ø> (ø)
R/gene_importances.R	100% <ø> (ø)
R/trajectory_inference.R	90.62% <100%> (ø)

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