[Contracts] Simplify implementation declarations

Author: nicolas-grekas

README.md

@@ -16,8 +16,8 @@ Design Principles
  * they must be backward compatible with existing Symfony components.
 
 Packages that implement specific contracts should list them in the "provide"
-section of their "composer.json" file, using the `symfony/*-contracts-implementation`
-convention (e.g. `"provide": { "symfony/cache-contracts-implementation": "1.0" }`).
+section of their "composer.json" file, using the `symfony/*-implementation`
+convention (e.g. `"provide": { "symfony/cache-implementation": "1.0" }`).
 
 FAQ
 ---

composer.json

@@ -25,9 +25,9 @@
     "suggest": {
         "psr/cache": "When using the Cache contracts",
         "psr/container": "When using the Service contracts",
-        "symfony/cache-contracts-implementation": "",
-        "symfony/service-contracts-implementation": "",
-        "symfony/translation-contracts-implementation": ""
+        "symfony/cache-implementation": "",
+        "symfony/service-implementation": "",
+        "symfony/translation-implementation": ""
     },
     "autoload": {
         "psr-4": { "Symfony\\Contracts\\": "" },