Add TTS Tech Guild talk to presentations (#30)

* Add TTS talk to presentations

* Update README.md to add link to TTS talk

* Remove trailing whitespace from README.md

README.md

@@ -15,6 +15,7 @@ Members of the Data Department occasionally present at meetups, conferences, and
 
 | Date       | Title                                                                                            | Topics                                                      | Video                                                                                                                      | Slides                                                                                               |
 |------------|--------------------------------------------------------------------------------------------------|-------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------|
+| 2024/06/14 | Data science and engineering for property tax equity                                             |  data engineering, sales validation, dbt, Athena            |                                                                                                                            | [PDF](https://github.com/ccao-data/public/raw/main/presentations/2024-06-14_TTS-TechGuild.pdf)       |
 | 2023/09/20 | Open-Source Property Assessment: Using Tidymodels to Help Allocate $16B of Annual Property Taxes | R, data science, predictive modeling, property taxes        | [YouTube](https://youtu.be/1_GivgmZYgM)                                                                                    | [PPTX](https://github.com/ccao-data/public/raw/main/presentations/2023-09-20_Posit-conf.pptx)        |
 | 2023/01/17 | Why Are Chicago Property Taxes So High? (And What Can Be Done to Lower Them?)                    | R, public finance, TIF, property taxes                      | [YouTube](https://youtu.be/zp5dHWnk2NE)                                                                                    | [PPTX](https://github.com/ccao-data/public/raw/main/presentations/2023-01-17_Chi-Hack-Night.pptx)    |
 | 2022/08/16 | Cook County Assessor's Residential Model V3                                                      | data science, predictive modeling, R, Tidymodels            | [YouTube](https://youtu.be/h0pwAr-WYxI)                                                                                    | [PPTX](https://github.com/ccao-data/public/raw/main/presentations/2022-08-16_Chi-Hack-Night.pptx)    |