Update README.md

Author: bill88t

README.md

@@ -24,6 +24,10 @@ help [COMMAND]
 
 OUTPUTS A BASIC LIST OF COMMANDS TO SERIAL OUT
 
+cd [DIR]...
+
+CHANGES TO SPECIFIED DIRECTORY
+
 
 ls [OPTIONS]... [DIR]...
 
@@ -59,7 +63,7 @@ move
 delete
 
 
-load [FILE]
+exec [FILE]
 
 LOADS AN .lja FILE AND EXECUTES IT'S COMMANDS
 
@@ -69,11 +73,11 @@ wait [TIME]
 IN SECONDS
 
 
-GOTO [LINE]
+goto [LINE]
 
 GOTO INTERPRETED LINE AND RERUN FROM THERE
 
-EXIT [CODE]
+exit [CODE]
 
 EXIT THE CURRENT PROCESS WITH AN EXIT CODE, DEFAULT = 0
 ```