Update syn, proc-macro2 and quote to 1.x (#4028)

substrate/srml/support/procedural/src/storage/genesis_config/genesis_config_def.rs

@@ -124,7 +124,7 @@ impl GenesisConfigDef {
 		for line in &def.extra_genesis_config_lines {
 			let doc = line.attrs.iter()
 				.filter_map(|a| a.parse_meta().ok())
-				.filter(|m| m.name() == "doc")
+				.filter(|m| m.path().is_ident("doc"))
 				.collect();
 
 			let default = line.default.as_ref().map(|e| quote!( #e ))

substrate/srml/support/procedural/src/storage/metadata.rs

@@ -175,7 +175,7 @@ pub fn impl_metadata(scrate: &TokenStream, def: &DeclStorageDefExt) -> TokenStre
 		let mut docs = TokenStream::new();
 		for attr in line.attrs.iter().filter_map(|v| v.parse_meta().ok()) {
 			if let syn::Meta::NameValue(meta) = attr {
-				if meta.ident == "doc" {
+				if meta.path.is_ident("doc") {
 					let lit = meta.lit;
 					docs.extend(quote!(#lit,));
 				}

substrate/srml/support/procedural/src/storage/mod.rs

@@ -307,7 +307,7 @@ impl StorageLineDefExt {
 
 		let doc_attrs = storage_def.attrs.iter()
 			.filter_map(|a| a.parse_meta().ok())
-			.filter(|m| m.name() == "doc")
+			.filter(|m| m.path().is_ident("doc"))
 			.collect();
 
 		Self {