Fix a typo in README.md (brianc#3002)

Change finanical to financial

Author: rikurauhala

Diff for: README.md

@@ -55,7 +55,7 @@ You can also follow me [@briancarlson](https://twitter.com/briancarlson) if that
 
 ## Sponsorship :two_hearts:
 
-node-postgres's continued development has been made possible in part by generous finanical support from [the community](https://github.com/brianc/node-postgres/blob/master/SPONSORS.md).
+node-postgres's continued development has been made possible in part by generous financial support from [the community](https://github.com/brianc/node-postgres/blob/master/SPONSORS.md).
 
 If you or your company are benefiting from node-postgres and would like to help keep the project financially sustainable [please consider supporting](https://github.com/sponsors/brianc) its development.