Minor changes to README to ensure a streamlined setup expierience #5066
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Installing: Added another comment before $ pip install python-telegram-bot --upgrade that reinforces the need for Python 3.10+. I know this was stated at the beginning of the README, but adding it here would just act as another safety right before install in case it was glossed over. Also, I added a short note that building PTB from source requires Python headers and a C compiler.
Optional Dependencies: Added -U to the pip installs just in case there are outdated dependencies.