fixed adding florestad to path while building

[mystical-prog]

the README has the incorrect command for adding florestad to the path, previously it was -

cargo install --path .

which resulted into the below error :

found a virtual manifest at '{path}/Floresta/Cargo.toml' instead of a package manifest

the new command is -

cargo install --path ./florestad

this makes sure that we are installing path from the correct directory and this command is run after executing the cargo build --release --bin florestad

[Davidson-Souza]

Nice catch! Thanks! ACK ad7b099