Prepare release v3.8 (#271)

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "metrics",
-  "version": "3.8.0-beta",
+  "version": "3.8.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "metrics",
-      "version": "3.8.0-beta",
+      "version": "3.8.0",
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "metrics",
-  "version": "3.8.0-beta",
+  "version": "3.8.0",
   "description": "An image generator with 20+ metrics about your GitHub account such as activity, community, repositories, coding habits, website performances, music played, starred topics, etc. that you can put on your profile or elsewhere !",
   "main": "index.mjs",
   "scripts": {