Be explicit about the supported versions of PHP

The constraint used for the PHP version is far too permissive as we cannot predict if the library will be compatible with future versions of PHP without any change.
Enalean · Jul 27, 2020 · ca91ad9 · ca91ad9
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diff --git a/composer.json b/composer.json
@@ -3,7 +3,7 @@
     "description": "Prometheus instrumentation library",
     "license": "Apache-2.0",
     "require": {
-        "php": ">=7.3",
+        "php": "^7.3|^7.4|^8.0",
         "ext-json": "*",
         "psr/http-client": "^1.0",
         "psr/http-factory": "^1.0",

diff --git a/composer.lock b/composer.lock