version 1.2.31

What's new in version 1.2.31

• Updated to Pico SDK version 2.0

pshell version 1.2.30

What's new in version 1.2.30

• fix compiler memory leak

pshell version 1.2.29

What's new in version 1.2.29

• update functions document
• fix extern table out of order
• add simple hexdump command
• add -p (paginate) option to cat and hex commands
• cat terminate on EOF (0x1A) char