Nu plugins now depend on nu-plugin crate.

crates/nu_plugin_match/src/main.rs

@@ -1,7 +1,7 @@
 use nu_errors::ShellError;
+use nu_plugin::{serve_plugin, Plugin};
 use nu_protocol::{
-    serve_plugin, CallInfo, Plugin, Primitive, ReturnSuccess, ReturnValue, Signature, SyntaxShape,
-    UntaggedValue, Value,
+    CallInfo, Primitive, ReturnSuccess, ReturnValue, Signature, SyntaxShape, UntaggedValue, Value,
 };
 
 use regex::Regex;