docs: turned the dash in "- Jesse" into an escape sequence (#1474)

Replaced the bullet point next to "Jesse" in the sponsorship section of the `README` into a dash. This is needed so the `README` renders properly on markdown viewers.

README.md

@@ -25,7 +25,7 @@ If Superpowers has helped you do stuff that makes money and you are so inclined,
 
 Thanks! 
 
-- Jesse
+\- Jesse
 
 
 ## Installation