Update README

README.md

@@ -74,11 +74,11 @@ For more information about printers, see the [Printers documentation](docs/PRINT
 
 ## Checks available
 
-Check | Purpose | Severity | Confidence
+Check | Purpose | Impact | Confidence
 --- | --- | --- | ---
 `--uninitialized`| Detect uninitialized variables | High | High
-`--pragma`| Detect if different pragma directives are used | Code Quality | High
-`--solc-version`| Detect if an old version of Solidity is used (<0.4.23) | Code Quality | High
+`--pragma`| Detect if different pragma directives are used | Informational | High
+`--solc-version`| Detect if an old version of Solidity is used (<0.4.23) | Informational | High
 
 
 ## License