Update README.md

Author: smarras79

README.md

@@ -264,7 +264,7 @@ include("./src/Jexpresso.jl")
 The path would look like 
 ```$JEXPRESSO/problems/equations/PROBLEM_NAME/PROBLEM_CASE_NAME```
 
-## Shallow comuli:
+## Shallow cumuli:
 Example of shallow cumuli simulations (right) for the type of Barbados clouds shown on the left: (picture taken from [P. Blossey webpage](https://www.atmos.washington.edu/~bloss/) from U. Washington)
 
 <img src="assets/barbados.jpg"