Move some range lints to complexity

Recategorize `range_plus_one` and `range_minus_one` to `complexity`.
This moves `range_plus_one` out of the nursery as the inclusive range
syntax is now stable. Both are moved to `complexity` as it is more
consistent with other lints such as `int_plus_one`.

Author: Michael Wright

clippy_lints/src/lib.rs

@@ -635,6 +635,7 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
         question_mark::QUESTION_MARK,
         ranges::ITERATOR_STEP_BY_ZERO,
         ranges::RANGE_MINUS_ONE,
+        ranges::RANGE_PLUS_ONE,
         ranges::RANGE_ZIP_WITH_LEN,
         redundant_field_names::REDUNDANT_FIELD_NAMES,
         reference::DEREF_ADDROF,
@@ -756,7 +757,6 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
         ptr::CMP_NULL,
         ptr::PTR_ARG,
         question_mark::QUESTION_MARK,
-        ranges::RANGE_MINUS_ONE,
         redundant_field_names::REDUNDANT_FIELD_NAMES,
         regex::REGEX_MACRO,
         regex::TRIVIAL_REGEX,
@@ -816,6 +816,8 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
         overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL,
         partialeq_ne_impl::PARTIALEQ_NE_IMPL,
         precedence::PRECEDENCE,
+        ranges::RANGE_MINUS_ONE,
+        ranges::RANGE_PLUS_ONE,
         ranges::RANGE_ZIP_WITH_LEN,
         reference::DEREF_ADDROF,
         reference::REF_IN_DEREF,
@@ -921,7 +923,6 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
         fallible_impl_from::FALLIBLE_IMPL_FROM,
         mutex_atomic::MUTEX_INTEGER,
         needless_borrow::NEEDLESS_BORROW,
-        ranges::RANGE_PLUS_ONE,
         unwrap::PANICKING_UNWRAP,
         unwrap::UNNECESSARY_UNWRAP,
     ]);

clippy_lints/src/ranges.rs

@@ -57,7 +57,7 @@ declare_clippy_lint! {
 /// ```
 declare_clippy_lint! {
     pub RANGE_PLUS_ONE,
-    nursery,
+    complexity,
     "`x..(y+1)` reads better as `x..=y`"
 }
 
@@ -75,7 +75,7 @@ declare_clippy_lint! {
 /// ```
 declare_clippy_lint! {
     pub RANGE_MINUS_ONE,
-    style,
+    complexity,
     "`x..=(y-1)` reads better as `x..y`"
 }