Update lab1.html

update broken link

workbook/01_datawrangling_3/lab1.html

@@ -1245,7 +1245,7 @@ <h2>Community Area Population Data</h2>
       </p>
       <p>Some more sleuthing reveals that the Chicago Metropolitan Agency
         for Planning (CMAP) has a <a
-          href="https://datahub.cmap.illinois.gov/dataset/community-data-snapshots-raw-data">Community Data Snapshots
+          href="https://geodacenter.github.io/data-and-lab/commpop/">Community Data Snapshots
           site</a> that contains a host of census data for the Chicago region, including population by community area
         for 2000 and 2010. As seen in
         Figure <a href="#fig:cmapsite">48</a>, there is a csv table with Chicago Community Area data, as well as a pdf
@@ -1467,4 +1467,4 @@ <h3>Quantile map</h3>
 
 </body>
 
-</html>
+</html>