Automate react-icons beta version number bump (#366)

.github/workflows/publish.yml

@@ -40,7 +40,7 @@ jobs:
         current_version = current_version.split('\"')[1]
         major,minor,asset,beta = current_version.split('.')
         asset = asset.replace('-beta','')
-        os.system(f'echo \"REACT_VERSION={major}.{minor}.{int(asset) + 1}-beta.{beta}\" >> \$GITHUB_ENV')
+        os.system(f'echo \"REACT_VERSION={major}.{minor}.{int(asset) + 1}-beta.{int(beta) + 1}\" >> \$GITHUB_ENV')
         """
 
     - name: Use Node 11