shorten CLI timezone flags, add docs

cli/README.md

@@ -135,6 +135,12 @@ Fetch a list of all the items saved in your YouTube/YouTube Music profile.
   `--auth` flag you can use authentication for any request.
 - `--lang` Change the YouTube content language
 - `--country` Change the YouTube content country
+- `--tz` Use a specific
+  [timezone](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) (e.g.
+  Europe/Berlin, Australia/Sydney)
+
+  **Note:** this requires building rustypipe-cli with the `timezone` feature
+- `--local-tz` Use the local timezone instead of UTC
 - `--report` Generate a report on every request and store it in a `rustypipe_reports`
   folder in the current directory
 - `--cache-file` Change the RustyPipe cache file location (Default:

cli/src/main.rs

@@ -55,13 +55,13 @@ struct Cli {
     /// YouTube content country
     #[clap(long, global = true)]
     country: Option<String>,
-    /// UTC offset in minutes
+    /// Use a specific timezone (e.g. Europe/Berlin, Australia/Sydney)
     #[cfg(feature = "timezone")]
     #[clap(long, global = true)]
-    timezone: Option<String>,
+    tz: Option<String>,
     /// Use local timezone
     #[clap(long, global = true)]
-    timezone_local: bool,
+    tz_local: bool,
     /// Use authentication
     #[clap(long, global = true)]
     auth: bool,
@@ -920,12 +920,12 @@ async fn run() -> anyhow::Result<()> {
     if let Some(botguard_bin) = cli.botguard_bin {
         rp = rp.botguard_bin(botguard_bin);
     }
-    if cli.timezone_local {
+    if cli.tz_local {
         rp = rp.timezone_local();
     }
 
     #[cfg(feature = "timezone")]
-    if let Some(timezone) = cli.timezone {
+    if let Some(timezone) = cli.tz {
         use time::OffsetDateTime;
         use time_tz::{Offset, TimeZone};