Fixed Chapter 7 summary image, and pillow version.

Author: rishal-hurbans

ch07-swarm_intelligence-particles/readme_assets/Ch7-Summary-PSO.png

@@ -21,7 +21,7 @@ matplotlib==3.1.1
 mccabe==0.6.1
 numpy==1.17.1
 pandas==0.25.1
-Pillow==6.2.0
+Pillow==6.2.2
 plotly==4.1.1
 protobuf==3.9.1
 pydotplus==2.0.2