update readme

README.md

@@ -3,14 +3,18 @@ p.5
 
 # cargo installs
 cargo install cargo-watch cargo-audit
+cargo install --version='~0.7' sqlx cli --no-default-features --features rustls,postgres
 # rustup installs
 rustup component add clippy rustfmt
 # database setup
 p.55
 
 # current page
-p. 56 @ 3.8.4.1
+p. 69 @ 3.8.5.5
 
 # dependencies
 ## linux
-- apt install pkg-config libssl-dev
+- apt install pkg-config libssl-dev postgresql-client
+
+# check if webserver alive
+after running `cargo run`, run `curl -v localhost:8000/health_check`, should return 200