fix(future): Be consistent in suggestion spacing

Author: epage

src/cargo/core/compiler/future_incompat.rs

@@ -502,10 +502,6 @@ https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html#the-patch
 {suggestion_header}"
         )
         .unwrap();
-        if suggestions.len() == 3 {
-            // HACK: there is an inconsistent leading line in this case
-            writeln!(&mut suggestion_message).unwrap();
-        }
         for suggestion in &suggestions {
             writeln!(
                 &mut suggestion_message,

tests/testsuite/future_incompat_report.rs

@@ -606,7 +606,6 @@ fn suggestions_for_updates() {
 [NOTE] 
 To solve this problem, you can try the following approaches:
 
-
 - Some affected dependencies have newer versions available.
 You may want to consider updating them to a newer version to see if the issue has been fixed.
 
@@ -655,7 +654,6 @@ means and how to resolve it.
 
 To solve this problem, you can try the following approaches:
 
-
 - Some affected dependencies have newer versions available.
 You may want to consider updating them to a newer version to see if the issue has been fixed.