title: Why is scale_y_continuous not working here? No error message given
body: <p>On my ggplot (see below), I was expecting <code>scale_y_continuous(breaks=(seq(0, 90, 10)))</code> to set y between 0 and 90 and spaced every 10.  Instead i get no y-axis or tick marks.</p>
  
  <p>A google search turned up this which didnt deal with exactly my problem:</p>
  
  <p><a href="https://stackoverflow.com/questions/43709180/scale-y-continuous-not-working">https://stackoverflow.com/questions/43709180/scale-y-continuous-not-working</a></p>
  
  <p>using <code>ylim()</code> allows me to alter the scale, but doesnt allow me to change interval to every 10.</p>
  
  <p>This is a dput of my data:</p>
  
  <pre><code>structure(list(dval = c(73.2, 76.7, 79.2, 74.9, 74.8, 76.8, 74.7, 
  74, 77.2, 74.6, 74.2, 72.7), date = structure(c(17646, 17655, 
  17675, 17681, 17701, 17729, 17743, 17751, 17757, 17778, 17793, 
  17800), class = "Date")), row.names = c(43215L, 43224L, 43244L, 
  43250L, 43270L, 43298L, 43312L, 43320L, 43326L, 43347L, 43362L, 
  43369L), class = "data.frame")
  </code></pre>
  
  <p>and this is the code i used to try and plot:</p>
  
  <pre><code>ggplot(test, aes(date, dval)) +
      #scale_y_continuous() should be mking Y between 0 and 90 and spaced every 10, but isnt...
      #ylim() works but doesnt set default spacing of 10
      scale_y_continuous(breaks=(seq(0, 90, 10))) +
      #ylim(0, 80) +
      geom_point()+
      geom_smooth(method=lm)
  </code></pre>