allow clippy::unreadable_literal in unicode tables

Also modifies the generation script to emit 2018 edition paths.

Author: euclio

src/libcore/unicode/tables.rs

@@ -1,6 +1,6 @@
 // NOTE: The following code was generated by "./unicode.py", do not edit directly
 
-#![allow(missing_docs, non_upper_case_globals, non_snake_case)]
+#![allow(missing_docs, non_upper_case_globals, non_snake_case, clippy::unreadable_literal)]
 
 use crate::unicode::version::UnicodeVersion;
 use crate::unicode::bool_trie::{BoolTrie, SmallBoolTrie};

src/libcore/unicode/unicode.py

@@ -79,10 +79,10 @@ class UnicodeFiles(object):
 PREAMBLE = """\
 // NOTE: The following code was generated by "./unicode.py", do not edit directly
 
-#![allow(missing_docs, non_upper_case_globals, non_snake_case)]
+#![allow(missing_docs, non_upper_case_globals, non_snake_case, clippy::unreadable_literal)]
 
-use unicode::version::UnicodeVersion;
-use unicode::bool_trie::{{BoolTrie, SmallBoolTrie}};
+use crate::unicode::version::UnicodeVersion;
+use crate::unicode::bool_trie::{{BoolTrie, SmallBoolTrie}};
 """.format(year=datetime.datetime.now().year)
 
 # Mapping taken from Table 12 from: