adds "b" shortcut for bool

src/influx.rs

@@ -130,6 +130,7 @@ macro_rules! measure {
     (@ea uuid, $meas:ident, $k:expr, $v:expr) => { $meas = $meas.add_field($k, $crate::influx::OwnedValue::Uuid($v)) };
     (@ea u, $meas:ident, $k:expr, $v:expr) => { $meas = $meas.add_field($k, $crate::influx::OwnedValue::Uuid($v)) };
     (@ea bool, $meas:ident, $k:expr, $v:expr) => { $meas = $meas.add_field($k, $crate::influx::OwnedValue::Boolean($v as bool)) };
+    (@ea b, $meas:ident, $k:expr, $v:expr) => { $meas = $meas.add_field($k, $crate::influx::OwnedValue::Boolean($v as bool)) };
     
     (@count_tags) => {0usize};
     (@count_tags tag $($tail:tt)*) => {1usize + measure!(@count_tags $($tail)*)};