updates readme

Author: ValJed

README.md

@@ -14,7 +14,7 @@ tasks lsc                     shows the list of contexts
 tasks add "{content}"         creates task based on content string
 tasks done {id}               marks one or several tasks (separated by a comma) as done 
 tasks rm {id}                 deletes one or several tasks (separated by a comma) based on the id 
-tasks rmc {name}              deletes context based on the name
+tasks rmc {name}              deletes context based on the name or its given id
 tasks clear                   deletes one or several contexts (separated by a comma) based on the name 
 
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