make jblond/php-cli optional

Author: JBlond

README.md

@@ -25,6 +25,10 @@ package. The reason for doing so is primarily because of its high degree of accu
 composer require jblond/php-diff
 ```
 
+### Install for cli support
+
+For cli usage you need to install the suggested `jblond/php-cli` package.
+
 ## Example Use
 
 ```PHP
@@ -107,7 +111,7 @@ Included is a light and a dark theme.
 
 * PHP 7.2 or greater
 * PHP Multibyte String
-* [jblond/php-cli](https://github.com/jblond/php-cli)
+* [jblond/php-cli](https://github.com/jblond/php-cli) (suggested)
 
 ## Issues and feature requests
 

composer.json

@@ -26,14 +26,16 @@
     "require": {
         "php": ">=7.2",
         "ext-mbstring": "*",
-        "ext-pcre": "*",
-        "jblond/php-cli": "^1.0"
+        "ext-pcre": "*"
     },
     "require-dev": {
         "phpunit/phpunit": "8.*",
         "squizlabs/php_codesniffer": "*",
         "phpmd/phpmd": "2.*"
     },
+    "suggest": {
+        "jblond/php-cli": "^1.0"
+    },
     "autoload": {
         "psr-4": {
             "jblond\\": "lib/jblond"