Update README.md

Author: datsom1

README.md

@@ -130,7 +130,8 @@ If the columns in the CSV have changed, those added or removed columns will be i
 
 ## Full CLI Helptext
 
-`Usage: db-diff \[OPTIONS\] PREVIOUS CURRENT
+$ db-diff --help
+Usage: db-diff \[OPTIONS\] PREVIOUS CURRENT
 
   Compare the differences between two CSV or JSON files to find differences.
 
@@ -145,4 +146,4 @@ Options:
   --version          Show the version and exit.
   -h, --help         Show this message and exit.
 
-  Example: db-diff old.csv new.csv --key=Id --output=jsonfile --outputfile=diff.json`
+  Example: db-diff old.csv new.csv --key=Id --output=jsonfile --outputfile=diff.json