build: 📝 Add version updater script for PHP files

Author: knice

package.json

@@ -40,5 +40,21 @@
         "README.md",
         "CHANGELOG.md",
         "LICENSE"
-    ]
-}
+    ],
+    "standard-version": {
+        "bumpFiles": [
+            {
+                "filename": "package-lock.json",
+                "type": "json"
+            },
+            {
+                "filename": "package.json",
+                "type": "json"
+            },
+            {
+                "filename": "plugin.php",
+                "updater": "wp-plugin-version-updater.js"
+            }
+        ]
+    }
+}

wp-plugin-version-updater.js

@@ -0,0 +1,10 @@
+module.exports.readVersion = function ( contents ) {
+	const capturingRegex = /Version: (?<vnum>[0-9]\.[0-9]\.[0-9])/;
+	const found = contents.match( capturingRegex );
+	return found.groups.vnum;
+};
+
+module.exports.writeVersion = function ( _contents, version ) {
+	const regex = /Version: (?<vnum>[0-9]\.[0-9]\.[0-9])/;
+	return _contents.replace( regex, 'Version: ' + version );
+};