chore: 🤖 use spec version to update README for docs

Author: prashantasdeveloper

README.md

@@ -12,7 +12,7 @@
 
 ## Polymesh version
 
-This release is compatible with Polymesh v7
+This release is compatible with Polymesh v7.0, v7.1, v7.2
 
 ## Getting Started
 

scripts/updateReadme.js

@@ -10,7 +10,7 @@ const getSupportedNodeVersion = () => {
     encoding: 'utf8',
   });
 
-  const regex = /export const SUPPORTED_NODE_VERSION_RANGE = '([^']+)';/g;
+  const regex = /export const SUPPORTED_SPEC_VERSION_RANGE = '([^']+)';/g;
 
   const match = regex.exec(constantsFile);