Add more lints

Cargo.toml

@@ -40,3 +40,25 @@ required-features = ["bot"]
 [[example]]
 name = "testbot_commands"
 required-features = ["bot"]
+
+[lints]
+rust.unsafe_code = { level = "forbid", priority = 1 }
+# Lint groups
+rust.deprecated_safe = "warn"
+rust.future_incompatible = "warn"
+rust.keyword_idents = "warn"
+rust.rust_2018_idioms = "warn"
+rust.unused = "warn"
+# Individual lints
+rust.non_local_definitions = "warn"
+rust.redundant_imports = "warn"
+rust.redundant_lifetimes = "warn"
+rust.single_use_lifetimes = "warn"
+rust.unit_bindings = "warn"
+rust.unnameable_types = "warn"
+rust.unused_crate_dependencies = "warn"
+rust.unused_import_braces = "warn"
+rust.unused_lifetimes = "warn"
+rust.unused_qualifications = "warn"
+# Clippy
+clippy.use_self = "warn"