Fixed error in README.md

README.md

@@ -26,7 +26,7 @@ Compilation options
  - **make buildrpm** - Generate a rpm package for Python extension
  - **make builddeb** - Generate a deb package for Python extension
  - **make standalone** - Create standalone programs (scattnlay and fieldnlay)
- - **make clean* - Delete temporal files
+ - **make clean** - Delete temporal files
 
 Use:
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