show a number of stories that fit the terminal window

hn.py

@@ -26,13 +26,13 @@ def main(stdscr):
     stdscr.clear()
 
     height, width = stdscr.getmaxyx()
-    num_stories = curses.LINES - 2 # headline and detail
+    num_stories = curses.LINES - 3 # headline, detail, footer
     # Query Hacker News API for top stories and their titles/links
     url = 'https://hacker-news.firebaseio.com/v0/topstories.json'
     r = requests.get(url)
     if not r.ok:
         raise Exception('Error fetching data from Hacker News API')
-    ids = r.json()[:10]
+    ids = r.json()[:num_stories]
     stories = []
     for idx, i in enumerate(ids):
         stdscr.clear()