Release v0.3

Update code in response to second round of reviews, including cosmetic changes to Figure 3.

Release v0.2

Update code in response to first round of reviews, including:

Update heatmap figure to add axis labels (src/figures/plot_heatmap.R)
Create a new plot that shows mortality ratio vs. invasion time (src/figures/plot_mortalityratio.R)
Update time series plot to show three possible management outcomes (src/figures/plot_timeseries.R)
Update sensitivity analysis plots (src/figures/plot_sensitivity_results.R)
Additional changes to ensure figures conform with journal requirements

release v0.1

initial release