title: Changing line type / width for each time series with autoplot and ggplot
body: <p>I am trying to create one plot to include two time-series:</p>
  
  <pre><code>library(zoo)
  library(tseries)
  library(ggplot2)
  library(ggfortify)
  
  ts1 &lt;- ts(c(1,2,3,4))
  ts2 &lt;- ts(c(1.1, 2.1, 3.1, 4.1))
  autoplot(ts.union(ts1, ts2), facets = FALSE) +
  scale_color_manual(breaks = c("ts1", "ts2"), labels = c("Actual", "Forecasted"), values=c("black", "red"))
  </code></pre>
  
  <p>After changing the legend titles and colors for each series I want to modify the line width and type, also by series, but calling <code>scale_linetype_manual</code> does not seem to change the plot by a bit. How should I proceed?</p>