Documentation: Fix main entrypoint option name

Author: yannoff

README.md

@@ -33,7 +33,7 @@ phpcc --version
 
 ```
 phpcc \
-    -e <entrypoint> \
+    -e <main> \
     -o <output> \
     [-d dir [-d dir ...]] \
     [-f file [-f file ...]] \
@@ -47,7 +47,7 @@ phpcc \
 Name /  Shorthand   |  Type | Description                                                                                                                                                                             |Required
 --------------------|:-----:|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:-------:
 `--output`, `-o`    | value | The Phar archive output file                                                                                                                                                            |y
-`--entrypoint`, `-e`| value | The main application entrypoint script                                                                                                                                                  |y
+`--main`, `-e`      | value | The main application entrypoint script                                                                                                                                                  |y
 `--banner`, `-b`    | value | Specify the filepath to the legal notice banner<br/>_Will be included in the human-readable part of the stub._                                                                          |n
 `--file`, `-f`      | multi | Adds a single file to the archive                                                                                                                                                       |n
 `--dir`,  `-d`      | multi | Adds a sources directory to the archive<br/>_Possible dir spec formats:<br/>- `$dir` => include all files in directory<br/>- `$dir:$extension` => filter files on a specific extension_ |n