Update Plug Node information

[jordy25519]

Update node info and binary name for Plug

See: cennznet/plug-blockchain#55 (comment)

Also:

• Update the binary and package name to plug
  

  plug-blockchain/Cargo.toml

  Line 2 in 3d533cf

  name = "substrate"

  
  

  plug-blockchain/Cargo.toml

  Line 6 in 3d533cf

  name = "substrate"

• Update Dockerfile
  

  plug-blockchain/Dockerfile

  Lines 39 to 55 in 3d533cf

  	useradd -m -u 1000 -U -s /bin/sh -d /substrate substrate
  	COPY --from=builder /substrate/target/$PROFILE/substrate /usr/local/bin
  	# checks
  	RUN ldd /usr/local/bin/substrate && \
  	/usr/local/bin/substrate --version
  	# Shrinking
  	RUN rm -rf /usr/lib/python* && \
  	rm -rf /usr/bin /usr/sbin /usr/share/man
  	USER substrate
  	EXPOSE 30333 9933 9944
  	VOLUME ["/data"]
  	CMD ["/usr/local/bin/substrate"]

• "plug-node"
  

  plug-blockchain/node/runtime/src/lib.rs

  Line 80 in c337602

  impl_name: create_runtime_str!("substrate-node"),

Maybe add some sweet ascii art too?

________________/\\\\\\_______/\\\________________        
 _______________\////\\\______/\\/\\_______________       
  ___/\\\\\\\\\_____\/\\\_____/\\\//\\___/\\\\\\\\__      
   __/\\\/////\\\____\/\\\____\//__\//___/\\\////\\\_     
    _\/\\\\\\\\\\_____\/\\\______________\//\\\\\\\\\_    
     _\/\\\//////______\/\\\_______________\///////\\\_   
      _\/\\\____________\/\\\_______________/\\_____\\\_  
       _\/\\\__________/\\\\\\\\\___________\//\\\\\\\\__ 
        _\///__________\/////////_____________\////////___