Remove stale README links

Author: dshkol

README.md

@@ -90,8 +90,6 @@ census_data <- get_census(dataset='CA16', regions=list(CMA="59933"),
 ### Examples of work using cancensus
 
 * [Income: A first look](https://doodles.mountainmath.ca/blog/2017/09/14/income-a-first-look/)
-* [Language Diversity in Canada](https://www.dshkol.com/2017/language-diversity-in-canada/)
-* [Diversity and Segregation in Canadian cities](https://www.dshkol.com/2018/diversity-and-segregation-canadian-cities/)
 * [Census tract level T1FF data](https://doodles.mountainmath.ca/blog/2020/04/23/census-tract-level-t1ff-tax-data/)
 
 We'd love to feature examples of work or projects that use cancensus.