update minimum core version to 2.0.0 (#266)

Author: wojcik91

src/lib.rs

@@ -46,7 +46,7 @@ pub(crate) mod proto {
 extern crate tracing;
 
 pub static VERSION: &str = concat!(env!("CARGO_PKG_VERSION"), "+", env!("VERGEN_GIT_SHA"));
-pub const MIN_CORE_VERSION: Version = Version::new(1, 6, 0);
+pub const MIN_CORE_VERSION: Version = Version::new(2, 0, 0);
 
 type CommsChannel<T> = (
     Arc<tokio::sync::Mutex<mpsc::Sender<T>>>,