pkg:native_stack_trace - fix sdk version range

Change-Id: I15632e69ecefb9644b2d2e04f6d5096744ad687d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151422
Auto-Submit: Kevin Moore <kevmoo@google.com>
Reviewed-by: Jake Macdonald <jakemac@google.com>
Commit-Queue: Jake Macdonald <jakemac@google.com>

Author: kevmoo

pkg/native_stack_traces/pubspec.yaml

@@ -5,7 +5,7 @@ version: 0.3.7
 homepage: https://github.com/dart-lang/sdk/tree/master/pkg/native_stack_traces
 
 environment:
-  sdk: '>=2.8 <3.0.0'
+  sdk: '>=2.8.0 <3.0.0'
 
 executables:
   decode: