Update README.md

Updated helptext

Author: datsom1

README.md

@@ -132,15 +132,15 @@ If the columns in the CSV have changed, those added or removed columns will be i
 ## Full CLI Helptext
 
     $ db-diff --help
-    Usage: db-diff \[OPTIONS\] PREVIOUS CURRENT
+    Usage: db-diff [OPTIONS] PREVIOUS CURRENT
 
       Compare the differences between two CSV or JSON files to find differences.
 
     Options:
-      --format TEXT      Explicitly specify input format. Available (csv|tsv|json) \[default: auto-detect based on file extension\]
-      --encoding TEXT    Input File Encoding. Available: (utf-8|utf-16|utf-16le|utf-16be|latin1|cp1252|ascii|...) \[default: utf-8\]
-      --key TEXT         Column to use as a unique ID for each row (ex: --key=Id) \[default: first column if not specified\] 
-      --output TEXT      Output format. Available: (readable|json|jsonfile)  \[default: readable\]
+      --format TEXT      Explicitly specify input format. Available (csv|tsv|json) [default: auto-detect based on file extension]
+      --encoding TEXT    Input File Encoding. Available: (utf-8|utf-16|utf-16le|utf-16be|latin1|cp1252|ascii|...) [default: utf-8]
+      --key TEXT         Column to use as a unique ID for each row (ex: --key=Id) [default: first column if not specified] 
+      --output TEXT      Output format. Available: (readable|json|jsonfile)  [default: readable]
       --outputfile FILE  File to write JSON output to (only used with --output=jsonfile)
       --showunchanged    If a record is changed, show ALL fields, not just the changed fields.
       --time             Measure and display elapsed time for the diff operation