fix(composer): be more stable when replacing picocms/pico

composer.json

@@ -1,5 +1,5 @@
 {
-    "name": "seacms/pico",
+    "name": "picocms/pico",
     "type": "library",
     "description": "Pico is a flat file CMS, this means there is no administration backend and database to deal with. You simply create .md files in the \"content\" folder and that becomes a page.",
     "keywords": ["pico", "picocms", "pico-cms", "simple", "flat-file", "cms", "content-management", "website", "markdown-to-html", "php", "markdown", "yaml", "twig" ],
@@ -31,16 +31,13 @@
         "source": "https://github.com/picocms/Pico"
     },
     "require": {
-        "php": "^7.0.8",
+        "php": "^7.0.8 || ^8.0",
         "ext-mbstring": "*",
         "twig/twig": "^2.12",
         "symfony/yaml" : "^3.4",
         "erusev/parsedown": "1.7.4",
         "erusev/parsedown-extra": "0.8.1"
     },
-    "replace": {
-        "picocms/pico": "3.0.0-alpha.2"
-    },
     "suggest": {
         "picocms/pico-theme": "Pico requires a theme to actually display the contents of your website. This is Pico's official default theme.",
         "picocms/pico-deprecated": "PicoDeprecated's purpose is to maintain backward compatibility to older versions of Pico.",