fix typo

Author: nashid

README.md

@@ -67,7 +67,7 @@ Next, the keys have been renamed slightly. The new names begin with coverageXXX,
 
 ## Multi project reports
 
-By default, scoverage will generate reports for each project seperately. You can merge them into an aggregated report by invoking `sbt coverageAggregate`.
+By default, scoverage will generate reports for each project separately. You can merge them into an aggregated report by invoking `sbt coverageAggregate`.
 
 (Note, you must do this after all the coverage data is complete as a separate command, so you cannot do `sbt coverage test coverageAggregate` (at least until a way around this is found).)