Downgrade large_digit_groups to pedantic

I believe if the user already decided to put underscores in their
literal, Clippy should be willing to believe that they put a number of
underscores that they felt was readable.

clippy_lints/src/lib.rs

@@ -514,6 +514,7 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
         if_not_else::IF_NOT_ELSE,
         infinite_iter::MAYBE_INFINITE_ITER,
         items_after_statements::ITEMS_AFTER_STATEMENTS,
+        literal_representation::LARGE_DIGIT_GROUPS,
         loops::EXPLICIT_INTO_ITER_LOOP,
         loops::EXPLICIT_ITER_LOOP,
         matches::SINGLE_MATCH_ELSE,
@@ -613,7 +614,6 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
         lifetimes::EXTRA_UNUSED_LIFETIMES,
         lifetimes::NEEDLESS_LIFETIMES,
         literal_representation::INCONSISTENT_DIGIT_GROUPING,
-        literal_representation::LARGE_DIGIT_GROUPS,
         literal_representation::MISTYPED_LITERAL_SUFFIXES,
         literal_representation::UNREADABLE_LITERAL,
         loops::EMPTY_LOOP,
@@ -794,7 +794,6 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
         len_zero::LEN_ZERO,
         let_if_seq::USELESS_LET_IF_SEQ,
         literal_representation::INCONSISTENT_DIGIT_GROUPING,
-        literal_representation::LARGE_DIGIT_GROUPS,
         literal_representation::UNREADABLE_LITERAL,
         loops::EMPTY_LOOP,
         loops::FOR_KV_MAP,

clippy_lints/src/literal_representation.rs

@@ -90,7 +90,7 @@ declare_clippy_lint! {
 /// ```
 declare_clippy_lint! {
     pub LARGE_DIGIT_GROUPS,
-    style,
+    pedantic,
     "grouping digits into groups that are too large"
 }