Update readme to remove 7.3 reference

Author: phpfui

README.md

@@ -4,14 +4,14 @@
 
 We all document our code with PHP [DocBlocks](https://en.wikipedia.org/wiki/PHPDoc) but we never seem to actually generate the documentation and add it to our project. Why? It simply takes too much time (over a minute), so we put it off till later, and later never comes.
 
-But with PHPFUI\InstaDoc, you can document your site in about a minute (OK, maybe 2). The steps involved:
- * Install PHPFUI\InstaDoc via Composer (30 seconds)
+But with PHPFUI/InstaDoc, you can document your site in about a minute (OK, maybe 2). The steps involved:
+ * Install PHPFUI/InstaDoc via Composer (30 seconds)
  * Run installation script (30 seconds)
  * Create document page (1 minute, 6 lines of code)
 
  Two minutes to usable documentation with the following features:
 
-## PHPFUI\InstaDoc Features
+## PHPFUI/InstaDoc Features
  * Always up to date, even with code that is not yet checked in
  * Send constructor information including parameters and default values to clipboard
  * Child and Parent class hierarchy clearly displayed and accessable
@@ -28,7 +28,7 @@ But with PHPFUI\InstaDoc, you can document your site in about a minute (OK, mayb
  * 5+ line config compatible with all PHP frameworks, or standalone
  * Uses [Foundation CSS framework](https://get.foundation) for a great experience on mobile
 
-### Install PHPFUI\InstaDoc (requires PHP >= 7.3)
+### Install PHPFUI/InstaDoc (requires PHP >= 7.4)
 ```
 composer require phpfui/InstaDoc
 ```
@@ -40,7 +40,7 @@ php vendor/phpfui/instadoc/install.php yourPublicDirectory/subDirectory
 Example: **php vendor/phpfui/instadoc/install.php public/PHPFUI** will add all needed files to public/PHPFUI, which will avoid any conflicts with your current files.  You can specify any directory by using \PHPFUI\Page::setResourcePath, but PHPFUI is recomended to keep things simple.
 
 ### Create Document Page
-PHPFUI\InstaDoc does not reply on any framework and can run on a standalone page. It is recommended that you do not make your documentation public, as PHPFUI\InstaDoc will display PHP source files. How you restrict access to the page is up to you.  The following does not restrict access and is simply an example:
+PHPFUI/InstaDoc does not reply on any framework and can run on a standalone page. It is recommended that you do not make your documentation public, as PHPFUI/InstaDoc will display PHP source files. How you restrict access to the page is up to you.  The following does not restrict access and is simply an example:
 
 ```php
 <?php
@@ -67,7 +67,7 @@ echo $controller->display();
 That is it. You are done!
 
 ### Adding New Classes
-PHPFUI\InstaDoc saves the classes to display in PHP serialized files.  Delete those files (.serial extension) when you want to display new classes. PHPFUI\InstaDoc will regenerate automatically if the files are missing.
+PHPFUI/InstaDoc saves the classes to display in PHP serialized files.  Delete those files (.serial extension) when you want to display new classes. PHPFUI/InstaDoc will regenerate automatically if the files are missing.
 
 ### Add Child Classes to the Docs
 ```php