Update example to use ticker search and cleanup output

Fix clippy warning

Update README with reference to SYMBOL_SEARCH

Make fields public

Fix clippy warnings

Remove unused imports

Fix formatting

Added Ticker Search (#5)

Manually implement fmt::Display and drop dependency on derive_more

Update reqwest to v0.12

Fix warning

Update cargo-tz to v0.8

Replace structopt with clap

Ignore .DS_Store

Fix clippy warnings