Description of change

Changes are:

1. Removed 'devnet' keyword in Iota(...) because not a known argument
2. Add length of 81 to random address generation, because call needs length passed as argument
3. Node expects 9 as min. weight magnitude, therefore added as argument to send_transfer call
4. changed URL to check transaction to https://explorer.iota.org/legacy-devnet/transaction/%s
   Fixing # (344).

Type of change

Choose a type of change, and delete any options that are not relevant.

• Documentation Fix

How the change has been tested

PyOTA Version: 2.1.0
Python Version: 3.8.8

Tested script locally, data is attached:
https://explorer.iota.org/legacy-devnet/transaction/RUXNMQXLCJ9FZNGZFFWYXZUISGAUQDFVWGOVEMUACGJWXQGEUZHFFWHKIRZLYVEIPLVEBEH9YOEBRZ999

Make sure to provide instructions for the maintainer as well as any relevant configurations.

Change checklist

Add an x to the boxes that are relevant to your changes, and delete any items that are not.

• My code follows the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (docs/ directory and/or docstrings in source code)
• I have followed PEP-8 Style Guide in my code.
• New and existing unit tests pass locally with my changes