Remove 'publish_details' deprecated query for entry from 1.0.x

remove whitespaces from api_key and access_token
added user-agent
added note in commands and README.md

Author: Aamod Pisat

README.md

@@ -4,7 +4,7 @@
 
 ## Installation
 
-**Note:  Please make sure that contentstack-express version 1.0.x is installed.**
+**Note:  Please make sure that contentstack-express version 1.x is installed.**
 
 Run the following command in a Terminal or Command Prompt to globally install the latest version of Built.io Contentstack CLI on your system: