Add sqlite details for ubuntu

libsqlite3-dev needed to avoid following error;

# pkg-config --cflags sqlite3
Package sqlite3 was not found in the pkg-config search path.
Perhaps you should add the directory containing `sqlite3.pc'
to the PKG_CONFIG_PATH environment variable
No package 'sqlite3' found
exit status 1
Update samples/booking.md
Merge pull request #84 from jgraham909/gh-pages

Additional steps to get sqlite3 installed on ubuntu