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Update getting-started.md 

Introduction to install on Unix based systems version mismatch.
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@ -22,15 +22,15 @@ Or just download in browser from website:
[http://www.antlr.org/download.html](http://www.antlr.org/download.html)
and put it somewhere rational like `/usr/local/lib`.
2. Add `antlr-4.5.3-complete.jar` to your `CLASSPATH`:
2. Add `antlr-4.7-complete.jar` to your `CLASSPATH`:
```
$ export CLASSPATH=".:/usr/local/lib/antlr-4.5.3-complete.jar:$CLASSPATH"
$ export CLASSPATH=".:/usr/local/lib/antlr-4.7-complete.jar:$CLASSPATH"
```
It's also a good idea to put this in your `.bash_profile` or whatever your startup script is.
3. Create aliases for the ANTLR Tool, and `TestRig`.
```
$ alias antlr4='java -Xmx500M -cp "/usr/local/lib/antlr-4.5.3-complete.jar:$CLASSPATH" org.antlr.v4.Tool'
$ alias antlr4='java -Xmx500M -cp "/usr/local/lib/antlr-4.7-complete.jar:$CLASSPATH" org.antlr.v4.Tool'
$ alias grun='java org.antlr.v4.gui.TestRig'
```