chore: add heroku meta

Author: z0al

app.json

@@ -1,13 +1,18 @@
 {
-  "env": {
-    "PRIVATE_KEY": {
-      "description": "the private key you downloaded when creating the GitHub App"
-    },
-    "APP_ID": {
-      "description": "the ID of your GitHub App"
-    },
-    "WEBHOOK_SECRET": {
-      "description": "the secret configured for your GitHub App"
-    }
-  }
+	"name": "commitlint-bot",
+	"description": "A GitHub App that runs commitlint for you",
+	"keywords": ["validate", "commit", "pr", "conventional", "git", "probot-app"],
+	"repository": "https://github.com/ahmed-taj/commitlint-bot.git",
+	"env": {
+		"PRIVATE_KEY": {
+			"description":
+				"the private key of your GitHub App. It must be base64 encoded!"
+		},
+		"APP_ID": {
+			"description": "the ID of your GitHub App"
+		},
+		"WEBHOOK_SECRET": {
+			"description": "the secret configured for your GitHub App"
+		}
+	}
 }